Removing Cam Cover Bolts the Hard Way

[Dynomite]

Removing Cam Covers for Camshaft Timing Inspection, replacement of PCV filters, checking top Timing Chain Guide for wear

Removing Torx 40 bolts Not so easy......but then turned out very easy.

1. Cam Covers were removed by first removing Bolts from C-Frame, Loosening Engine Mount Bolts and then dropping Transmission a bit so cam covers could clear Brake Booster (two Torx-40 bolts near brake booster were removed with cam cover). On the Passenger side the Temperature sensor for Evaporator was removed easily and set aside (plenty room to then remove cam cover bolts and then cam cover on passenger side). The Transmission was lowered to remove Torx-40s on passenger side and then raised to remove Cam Cover on passenger side clearing Fire Wall bolts.

2. Now the Hard Part......as can be seen five Torx-40 Cam Cover Bolts failed in the Torx receiver on the bolt head even though considerable downward pressure was applied to the Torx-40 socket/wrench. Several types of Torx 40s wrenches had to be used because of the clearance. Considerably more torque than the 19 ft-lbs for Torx-40 Cam Cover bolt installation was applied trying to remove them (a cheater on a 1/2 inch socket wrench) :D

3. Now the Easy Part........What to do.....Drill, Heat....Torch...
a. I tried drilling and ruined three drill bits.
b. I did not want to try heat (A little heat works great on Injector Housing for removal of Coolant Manifold Bolts) as there is no way to get heat where it is needed.
c. Chisel.....:)......well wouldn't you know it.....Using a chisel to first notch one side of the bolt and then pounding that side counter clockwise with the chisels about 10 times without touching the Aluminum Cam Cover surface popped the bolt loose (all five). I would never have guessed it but ran out of options as I was just going to use a chisel to knock the Torx-40 bolt heads off (a poor concept in itself) :D

http://i287.photobucket.com/albums/ll142/dynomite007/Maintenance%20ZR1/a8c26278-b70f-4e84-9b53-330c42a1d226.jpg (http://s287.photobucket.com/user/dynomite007/media/Maintenance%20ZR1/a8c26278-b70f-4e84-9b53-330c42a1d226.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/Maintenance%20ZR1/01cdf99e-9f02-409f-b7ec-4a5b59883582.jpg (http://s287.photobucket.com/user/dynomite007/media/Maintenance%20ZR1/01cdf99e-9f02-409f-b7ec-4a5b59883582.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/Maintenance%20ZR1/c8db244c-9a15-4253-b644-064d00579b8c.jpg (http://s287.photobucket.com/user/dynomite007/media/Maintenance%20ZR1/c8db244c-9a15-4253-b644-064d00579b8c.jpg.html)

Removing Cam Cover and Camshaft Timing Inspection (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581665190)

[GOLDCYLON]

Stainless upgrade time

[Dynomite]

Yes.....have the SS ready
And painting cam covers also vice powder coat ;)

[HAWAIIZR-1]

Yes.....have the SS ready
And painting cam covers also vice powder coat ;)

Hey Cliff,
Sorry for the dumb question, but any particular reason painting over PC? Just curious and trying to learn something.

Thanks,
Craig:handshak:

[Dynomite]

This my 90'.....my 91' is full PCed.

I want this up and running this next week and I figured I can always PC later.
Actually just experimenting with Rustoleum Silver (high temp) :D

Plenum looks great with red letters. Will post photo tomorrow.

SW complete offroad exhaust and SS intake
Air box also here next week (George Braml) ;)

Since I have C Frame disconnected also installing ZFdoc C Frame plates.
Keeping secondaries so I can say I know how to maintain them on this 90' :D
And New Water pump and Randy's aluminum pulleys.

Did the usual differental drain install and the usual TB coolant elimination to make those Plenum pulls a 30 minute job :cheers:

Also experimental Belt Tensioner Pulley.
Already have nice new aluminum radiator it turns out I did not know about when I got this 90' ;)

[LGAFF]

Wow I zoomed through them with a drill bit when I did it

[WVZR-1]

This is the ideal device for loosening a "stubborn" anything and is very controlable. Used one this afternoon to remove door hardware on a '58.

http://buy1.snapon.com/catalog/objects/28600/28524.JPG

There's a 1/2" also.

Here's a SnapOn link:

http://buy1.snapon.com/catalog/printPage.asp?tool=&Item_id=15082&PartNo=PH1038&Price=36&Desc=&SUB_Cat_ID=120766&SUB_Cat_NAME=Air+Hammer+Bits+And+Accessories&Cat_ID=120430&Cat_NAME=Power+Tools,+Air&group_id=2423&group_NAME=Socket+Adaptors&store=snapon-store&dir=&pix=objects/28600/28524.JPG&email=true

[Schrade]

Did the assembly teams put them in dry?

Just seems that the best hardware, assembled dry, ain't the best, IMO...

When I pull ANY bolt / screw, it goes back STERILE, in a STERILE hole (with clean grease).

[Dynomite]

I removed these cam cover bolts with engine installed so you all know the limits of space. A chisel could reach most of the bolts at
the angle required to punch them counterclockwise.

I was amazed how well the chisel worked especially in tight places like the lower row of Torx-40 bolts on passenger side.

[WVZR-1]

I removed these cam cover bolts with engine installed so you all know the limits of space. A chisel could reach most of the bolts however at
The angle required to punch them counterclockwise.

I was amazed how well the chisel worked.

The air hammer socket adapter destroys "nothing" better than probably 95% of the time and this '58 will go back together using the OE original hardware. There's no "oh sh!t it slipped" damage either.

[Dynomite]

The part about pulling Cam Covers with Engine In Car that I do not want to think about is one of those two Torx-40s bottom row by Brake Booster.....or bottom row toward fire wall on passenger side. If those get stubborn it is almost pull engine time ;)

I would then pull brake booster to see what space is available.

Wow I zoomed through them with a drill bit when I did it But you need a drill to fit somewhere for a straight shot at the Torx-40. My drill bits are duller than yours......and drilling gets very messy with shavings all over but drilling is definitely an option :thumbsup:

[rhipsher]

This is exactly what I used years ago to get my cam cover bolts off because 50% of mine were a b#@ch to get off. With this impact driver even if the torx pattern was stripped it didn't matter because with every hit it dug in deeper to the head of the bolt in a CCW fashion and drove them right out in seconds. Haven't used it for anything since.
http://i301.photobucket.com/albums/nn63/keeno1970/impactdriver_zps021c83b1.jpg

[Dynomite]

Wow I zoomed through them with a drill bit when I did it

This is the ideal device for loosening a "stubborn" anything and is very controlable. Used one this afternoon to remove door hardware on a '58.


This is exactly what I used years ago to get my cam cover bolts off because 50% of mine were a b#@ch to get off. With this impact driver even if the torx pattern was stripped it didn't matter because with every hit it dug in deeper to the head of the bolt in a CCW fashion and drove them right out in seconds. Haven't used it for anything since.

I am just guessing but I think these three methods being all good methods will only work on ALL of the Torx-40 Cam Cover bolts with engine out of car. The lower row on both the passenger side and drivers side are a tight squeeze toward the fire wall.

[rhipsher]

I did it with my engine in the car but the brake booster has to be out and that box with the heat sink in it on the passengers side has to be removed. Also the inner wheel wells have to be removed then you will be able to get to them at all angles. If I did it you can do it.

[Dynomite]

I did it with my engine in the car but the brake booster has to be out and that box with the heat sink in it on the passengers side has to be removed. Also the inner wheel wells have to be removed then you will be able to get to them at all angles. If I did it you can do it.

Ah........OK....removing the inner wheel wells is the trick for lower row of Torx-40.....Leaning every day :thumbsup:

And it appears removing the brake booster gives plenty room on drivers side. There still is limiited room on passenger side without removing the evaporator I think. I did remove the box with heat sink which gave more room. but inner wheel wells is the trick required for that lower row of Torx-40s.

Not so sure about if you did it I can do it :D but thanks ;)

[HAWAIIZR-1]

Okay, I understand about the paint versus PC. I still have nightmares about removing that darn brake booster..............

[Scrrem]

Okay, I understand about the paint versus PC. I still have nightmares about removing that darn brake booster..............
I'm with you there Craig!!! What a PITA!!
Rich

[Dynomite]

Okay, I understand about the paint versus PC. I still have nightmares about removing that darn brake booster I did not have to remove brake booster as the six lower Torx-40s near fire wall on drivers side came out without issues..............

Hi Craig.......here is the Painted Plenum. Cam Covers get painted today same Silver color ;)
You can see Carter's and Lee's work installed on the Plenum :thumbsup:

TB Coolant has been removed.

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/7031cc9d-c6f5-4268-a53c-38eee7f56eb8.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/7031cc9d-c6f5-4268-a53c-38eee7f56eb8.jpg.html)

The Z on Jack Stands for Top End (excluding Heads) with hydraulic jack under Transmission for tilting engine (C-Frame set aside) as required for Cam Cover removal and Plenum Removal (also great height for Exhaust removal and SW Headers/Exhaust installation). I might end up with some John Deere Parts on the LT5 :D

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/75fa3001-85b9-4d3f-92e9-5b11eac49511.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/75fa3001-85b9-4d3f-92e9-5b11eac49511.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/89489b63-f696-4b1c-a302-e48a066b8245.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/89489b63-f696-4b1c-a302-e48a066b8245.jpg.html)

[HAWAIIZR-1]

I'm with you there Craig!!! What a PITA!!
Rich Yeah, that is something you only want to do once in your life, unless there is an "easy" way to do it that I don't know about? I only replaced my because it looked ugly and I had a new one on the shelf.

[HAWAIIZR-1]

Hi Craig.......here is the Painted Plenum. Cam Covers get painted today same Silver color ;)
You can see Carter's and Lee's work installed on the Plenum

TB Coolant has been removed.

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/7031cc9d-c6f5-4268-a53c-38eee7f56eb8.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/7031cc9d-c6f5-4268-a53c-38eee7f56eb8.jpg.html)

The Z on Jack Stands for Top End (excluding Heads) with hydraulic jack under Transmission for tilting engine (C-Frame set aside) as required for Cam Cover removal and Plenum Removal (also great height for Exhaust removal and SW Headers/Exhaust installation). I might end up with some John Deere Parts on the LT5 :D

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/75fa3001-85b9-4d3f-92e9-5b11eac49511.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/75fa3001-85b9-4d3f-92e9-5b11eac49511.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/89489b63-f696-4b1c-a302-e48a066b8245.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/89489b63-f696-4b1c-a302-e48a066b8245.jpg.html)

Looks great Cliff! Man, I wish I had all the room you have there. :cheers:

[Dynomite]

Looks great Cliff! Man, I wish I had all the room you have there. :cheers:

That 40 foot bifold door makes getting in and out easy.....I can almost make a U turn in the door way.

Just got done painting Cam Covers...have to do Corvette in Red yet.
Will install Cam Covers/Plenum this weekend and fire it up :dancing

I will take a photo for ya all Running.....and let you know how the Paint does after a few hours on the engine :handshak:

Oh...got that New Belt Tensioner installed also for a test run :D
And some other stuff....:-D

Working on some photos and summary here 1990 LT5 Specific Top End Rebuild Tricks (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581658776)

[HAWAIIZR-1]

That 40 foot bifold door makes getting in and out easy.....I can almost make a U turn in the door way.

Just got done painting Cam Covers...have to do Corvette in Red yet.
Will install Cam Covers/Plenum this weekend and fire it up :dancing

I will take a photo for ya all Running.....and let you know how the Paint does after a few hours on the engine :handshak:

Oh...got that New Belt Tensioner installed also for a test run :D
And some other stuff....:-D

Working on some photos and summary here 1990 LT5 Specific Top End Rebuild Tricks (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581658776)

You sure do stay busy working on your Corvettes.

Please keep me posted on that tensioner testing (not sure if I want the billet or polished look yet).

You know that I live in two places (Japan and Hawaii) with land being premium cost and real estate like yours is only a dream.:cry:

[Dynomite]

You sure do stay busy working on your Corvettes.

Please keep me posted on that tensioner testing (not sure if I want the billet or polished look yet).

You know that I live in two places (Japan and Hawaii) with land being premium cost and real estate like yours is only a dream.:cry:

It has been raining a lot here lately so I stay in shed with tools (one tool chest SAE and one tool chest METRIC), tractors, trucks (and other farm machinery) and corvettes :D

I like Billet as it is less chrome looking and matches all of Carter's machine work which is in Aluminum. Carter's TB Engraving is howerver polished which fits in with the Billet look as you can see on that newly Painted Plenum.

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/37cdb647-2dda-449e-8d0d-57905f95ecfd.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/37cdb647-2dda-449e-8d0d-57905f95ecfd.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/8e46b8a0-fd42-44c0-b89b-e3e8f15bab7f.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/8e46b8a0-fd42-44c0-b89b-e3e8f15bab7f.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/63e1fa11-78c9-4c58-9752-51a0f3cbb766.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/63e1fa11-78c9-4c58-9752-51a0f3cbb766.jpg.html)

[HAWAIIZR-1]

It has been raining a lot here lately so I stay in shed with tools (one tool chest SAE and one tool chest METRIC), tractors, trucks (and other farm machinery) and corvettes :D

I like Billet as it is less chrome looking and matches all of Carter's machine work which is in Aluminum. Carter's TB Engraving is howerver polished which fits in with the Billet look as you can see on that newly Painted Plenum.

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/37cdb647-2dda-449e-8d0d-57905f95ecfd.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/37cdb647-2dda-449e-8d0d-57905f95ecfd.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/8e46b8a0-fd42-44c0-b89b-e3e8f15bab7f.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/8e46b8a0-fd42-44c0-b89b-e3e8f15bab7f.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/63e1fa11-78c9-4c58-9752-51a0f3cbb766.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/63e1fa11-78c9-4c58-9752-51a0f3cbb766.jpg.html)

I agree with the billet look too. I only have a few chromed or polished item on my LT5 too.:handshak:

[Dynomite]

I agree with the billet look too. I only have a few chromed or polished item on my LT5 too.:handshak:
Cam Covers back on (The easy way with SS Allen Head Bolts) and Belt tensioner installed with belt :cheers:

Will connect stock exhaust back up and fire it up tomorrow.....then convert to SW exhaust system a bit later.
Installing C-Frame braces from ZFdoc tomorrow before installing the exhaust.

Then the Top Secret Coolant installation assuring the water pump will not cavitate. The Top Secret method was developed and tested a month ago on the 91' ZR1. It involves some lung capacity not to give it away :D This Top Secret Coolant installation is especially required since I have TB coolant blocked on this top end restoration. Did add new vacuum canisters and SS oil cooler lines also along with the new Ignition coils, plugs and plug wires ;)

Also replaced Control Valve Linkage each side Control Valve Linkage - New (http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=8&products_id=179) as old linkage was loose at the fittings and sticky at each pivot joint. Added just a bit of white greese to each small ball joint.

Along with some experimental Bling Experimental Bling (http://www.zr1.net/forum/showthread.php?p=172934)

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/c542a676-94c5-41a6-bf79-0caf338bdbe6.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/c542a676-94c5-41a6-bf79-0caf338bdbe6.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/0e7e60da-7a1a-498b-bc9a-2bbcdb69505a.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/0e7e60da-7a1a-498b-bc9a-2bbcdb69505a.jpg.html)

[HAWAIIZR-1]

Looks good Cliff! That alternator looks like AM too and billet? Let us know how the pulleys do after you put some 8K rpm runs on it.

What do you think about this? http://www.trufilter.com/products/detail/37

[Dynomite]

Looks good Cliff! That alternator looks like AM too and billet? Let us know how the pulleys do after you put some 8K rpm runs on it.

What do you think about this? http://www.trufilter.com/products/detail/37

It appears they do not have one for the 1990 ZR1 yet.....

Alternator Pulley is steel (I think) but brass color Experimental Bling (http://www.zr1.net/forum/showthread.php?p=172934)

[Gunny]

Okay, I understand about the paint versus PC. I still have nightmares about removing that darn brake booster..............


When I took off the covers for refinishing, the right side was a breeze with absolutely no problems. The left side was a nightmare and I broke off 4 bolts and ultimately broke off one easy out ... I had to get outside help but eventually got everything off. I did take off the brake booster but have since learned that, with the proper combination of tools/technique, that the covers can be removed without removing the brake booster. It was explained to me but I haven't seen it done, nor have I done it. So take it for what's it's worth.

George

[Dynomite]

When I took off the covers for refinishing, the right side was a breeze with absolutely no problems. The left side was a nightmare and I broke off 4 bolts and ultimately broke off one easy out ... I had to get outside help but eventually got everything off. I did take off the brake booster but have since learned that, with the proper combination of tools/technique, that the covers can be removed without removing the brake booster. It was explained to me but I haven't seen it done, nor have I done it. So take it for what's it's worth.

George

I removed the cam covers without removing the brake booster. A little trick is to have the C-Frame set aside and a hydraulic jack under the transmission (with engine mounting bolts loosened). This allows you to raise and lower the rear of the LT5 instantly as you lower it to remove drivers side rear two lower cam cover bolts and raise rear of LT5 to gain clearance between passenger side cam cover and screw on fire wall.

To install Cam Covers without removing Brake Booster you have to place those two drivers side lower Cam Cover Bolts in the Cam Covers before you position the Cam Cover.

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/d620ad51-60de-4c8f-90a5-b000c797da59.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/d620ad51-60de-4c8f-90a5-b000c797da59.jpg.html)

[HAWAIIZR-1]

It appears they do not have one for the 1990 ZR1 yet.....

Alternator Pulley is steel (I think) but brass color Experimental Bling (http://www.zr1.net/forum/showthread.php?p=172934)

Cliff, the part number I showed for the oil filter is for our cars and now showing application on their site yet.

I was wondering about your alternator itself that looked different in the photos. I'm still following up with the billet alternator I'm purchasing. I have Randy Woods full underdrive pulley set myself and they are awesome.....I guess everything and anything from the Woods' family are awesome.

[HAWAIIZR-1]

When I took off the covers for refinishing, the right side was a breeze with absolutely no problems. The left side was a nightmare and I broke off 4 bolts and ultimately broke off one easy out ... I had to get outside help but eventually got everything off. I did take off the brake booster but have since learned that, with the proper combination of tools/technique, that the covers can be removed without removing the brake booster. It was explained to me but I haven't seen it done, nor have I done it. So take it for what's it's worth.

George

George,
Now I do remember you sharing that story and it helped me with my own situation years ago. It is still easier than replacing a head with the motor in the car that I did......now that was challenging....and timing the cams with the motor in the car was even worse, but I did it. :cheers:

[Dynomite]

Cliff, the part number I showed for the oil filter is for our cars and now showing application on their site yet.

I was wondering about your alternator itself that looked different in the photos. I'm still following up with the billet alternator I'm purchasing. I have Randy Woods full underdrive pulley set myself and they are awesome.....I guess everything and anything from the Woods' family are awesome.

The Alternator is just shined up on a wire wheel ;)

I am following your Billet Alternator thread and appreciate your experimentation when it comes to modifications of the ZR1 :thumbsup:

Also have Randy Woods Dad's LT5X studs in my 91' as I thought I would be removing the heads often.

I did remove the heads once after the stud installation and those studs can be reused over and over again.

LT5X Studs (Randy Woods)
http://i287.photobucket.com/albums/ll142/dynomite007/B%20Engine%20LT5/SLT5XStuds_zps2392e9c3.jpg
timing the cams with the motor in the car was even worse, but I did it.

I am very impressed with your timing the LT5 engine in car...the closest I got to timing engine in car this time was checking the key holes in the front camshaft retainers to make sure they were all four centered at 51 deg BTDC.....they were perfect and on a 67K engine.

Starting Timing by Pinning on my 91' engine out of car
http://i287.photobucket.com/albums/ll142/dynomite007/C%20Engine%20LT5/b976eed8-16eb-4669-a8e4-34d23ebbec81.jpg (http://s287.photobucket.com/user/dynomite007/media/C%20Engine%20LT5/b976eed8-16eb-4669-a8e4-34d23ebbec81.jpg.html)

I did replace the PCV filters in cam covers and the top timing chain guide in cam covers had no wear on either of them. What is holding me up now is I lost one of those PCV tube "O" rings in Cam Cover.


It is still easier than replacing a head with the motor in the car that I did......now that was challenging

I removed the Heads (my 91') also engine in car but when I got the heads off I could almost lift by hand the rest of the motor (oil pan was off also) :D

Removing Heads without removing the Brake Booster
http://i287.photobucket.com/albums/ll142/dynomite007/91%20ZR1/5e74dba3-03f7-478b-98ae-451327e6ce8e.jpg (http://s287.photobucket.com/user/dynomite007/media/91%20ZR1/5e74dba3-03f7-478b-98ae-451327e6ce8e.jpg.html)

Cliff

[Dynomite]

90' is All Up and RUNNING :p

It is a GO Craig :thumbsup:

Ebay Billet Aluminum Belt Tensioner Pulley (http://www.ebay.com/itm/290580284103?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649)

All Pulleys are super quiet and run sooooooo smooth at all RPMs.

Forgot the emblems on Cam Covers...Jerry has them in the mail.

You might notice Eliminated TB Coolant and Added Oil Catch Can among some other modifications such as elimination of Air Induction .

And.....my oil pressure gauge is no longer pegged out (now at 65 psi cold) ...must have been a wire to the sensor.
And.....Vacuum pump now hardly cycles at idle at all .......must have cured some vacuum line leaks.

Summary of 90' Reconditioning/Modifications (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581665197)

You will notice this photo taken with engine running is not blury at all indicating absolutely NO VIBRATION
Of either the Alternator Pulley or Belt Tensioner Pulley.
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/2efc9d53-8eb4-4bc7-be9c-4f457409a58a.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/2efc9d53-8eb4-4bc7-be9c-4f457409a58a.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/8f51ca7f-5ed1-4b78-8917-e8d107332bc7.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/8f51ca7f-5ed1-4b78-8917-e8d107332bc7.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/f1e67ee1-dca6-4b7e-b799-feb1ba5026d5.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/f1e67ee1-dca6-4b7e-b799-feb1ba5026d5.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/4278f2f6-4873-4a49-809e-de9dbb5db773.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/4278f2f6-4873-4a49-809e-de9dbb5db773.jpg.html)

[HAWAIIZR-1]

Thanks for sharing Cliff and everything looks great. That was a good investment with the head studs from Randy Woods too. I might have to bug you more if I run into any issues and will try the pulley while I'm at it. Do these mods ever end? I think the only way I will leave this car alone is if I stop looking at this website. Take care and thanks again, Craig :cheers:

[Dynomite]

Thanks for sharing Cliff and everything looks great. That was a good investment with the head studs from Randy Woods too. I might have to bug you more if I run into any issues and will try the pulley while I'm at it. Do these mods every end? I think the only way I will leave this car alone is if I stop looking at this website. Take care and thanks again, Craig :cheers:

Just remember the Billet Aluminum Belt Tensioner Pulley when inststalling needs just a 5 minute touch up of the Belt Tensioner outer Boss and install the pulley with the bearing snap ring facing the engine See item #9 of Bling (Carter and Others) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581665201)

[HAWAIIZR-1]

Just remember the Billet Aluminum Belt Tensioner Pulley when inststalling needs just a 5 minute touch up of the Belt Tensioner outer Boss and install the pulley with the bearing snap ring facing the engine See item #9 of Bling (Carter and Others) (http://forums.corvetteforum.com/c4-zr-1-discussion/3005470-tech-info-lt5-modifications-rebuild-tricks-500-hp-4.html#post1581665201)

Okay, thanks. I'll be sure to consult with you before I jack it up. :handshak:

[Bob Eyres]

Does anybody offer an SS Allen head bolt set for the covers in black that looks more like the stock bolt?
It would be nice to have the advantage of the Allen head, but retain the original look.

[Dynomite]

Does anybody offer an SS Allen head bolt set for the covers in black that looks more like the stock bolt?
It would be nice to have the advantage of the Allen head, but retain the original look.

I am not sure about SS but there are plenty of Metric 8mm x 1.25 Black Oxide Allen Head bolts available........and the Cam Cover Bolts do not have to be torqued more than about 19 ft-lbs. I use Dowty Washers which have a rubber seal (Jerry's Gaskets) which rubber seal acts as a lock washer Cam Cover Dowty Washers (http://jerrysgaskets.com/store2/root/index.php?main_page=product_info&cPath=0&products_id=30)

Painting Cam Covers and Plenum (the quick substitute for Powder Coating) :D
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/49b05cc4-bb84-4449-af48-80241b98e38a.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/49b05cc4-bb84-4449-af48-80241b98e38a.jpg.html)http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/37cdb647-2dda-449e-8d0d-57905f95ecfd.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/37cdb647-2dda-449e-8d0d-57905f95ecfd.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/8f51ca7f-5ed1-4b78-8917-e8d107332bc7.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/8f51ca7f-5ed1-4b78-8917-e8d107332bc7.jpg.html)
http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/f1e67ee1-dca6-4b7e-b799-feb1ba5026d5.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/f1e67ee1-dca6-4b7e-b799-feb1ba5026d5.jpg.html)

[HAWAIIZR-1]

Cliff,

Billet pulley on the way from UPR racing. Thanks again and I'll let you know if I need any help with the mod. Looking at your other post, I think I got it. :handshak: The billet aluminum alternator housings are done so I'll update how those are once I get them; not enough interest for a group buy.

Craig

[Dynomite]

Cliff,

Billet pulley on the way from UPR racing. Thanks again and I'll let you know if I need any help with the mod. Looking at your other post, I think I got it. :handshak: The billet aluminum alternator housings are done so I'll update how those are once I get them; not enough interest for a group buy.

Craig

I've run the Billet Aluminum Belt Tensioner Pulley now a couple weeks with absolutely NO issues :thumbsup:

Belt Tensioner Billet Aluminum Ultra Light Pulley
http://i287.photobucket.com/albums/ll142/dynomite007/Maintenance%20ZR1/BeltTensionerAluminumPulley.jpg (http://s287.photobucket.com/user/dynomite007/media/Maintenance%20ZR1/BeltTensionerAluminumPulley.jpg.html)

Experimental Bling (http://www.zr1.net/forum/showthread.php?p=172411#)

Ebay Billet Aluminum Belt Tensioner Pulley (http://www.ebay.com/itm/290580284103?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649)
Ebay Brass Colored Alternator Pulley (http://www.ebay.com/itm/230773124143?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649)

http://i287.photobucket.com/albums/ll142/dynomite007/A%20Corvette%20LT5%2090/2efc9d53-8eb4-4bc7-be9c-4f457409a58a.jpg (http://s287.photobucket.com/user/dynomite007/media/A%20Corvette%20LT5%2090/2efc9d53-8eb4-4bc7-be9c-4f457409a58a.jpg.html)