Secondchance - 380 build begins!
 

Some of you may remember my posting and confirmation that my head gasket gad failed.
Initial reaction - S**t!!! So, obviously I accepted having to redo the head gasket. Of course, naturally then would be a good idea to service the valves, lifters, proper cam timing.
Did it stop there? Course not! Might as well go to 4" liners and pistons, etc, etc, etc...
Eventually this has turned into 4" pistons and liners and offset grind crankshaft to 3.76" stroke resulting in 378 - I'll be referring to it as 380.
First step was to pick up a take off crankshaft from Phil's 402 doner LT5 and send it off to one of the forum member/engine builder (keeping magnanimity just in case...).
By next week, my Z will be at my friend's/local mechanic, also w/ 1990 Z, for an engine pull and disassembly. Already lined up friends who will handle head porting and plenum/IH porting.
I did consider getting a new crate motor but then I'll only be back where I had started, right? I have never had a car with a modified motor, never even dreamed of it - so beyond my reach! Now that this is a reality, I am ecstatic beyond belief!
Just want to say that all this started because I had a great fortune of running into the WAZOO clan and having hung around this forum hanging with you guys.

Thank you guys!!!

Re: Secondchance - 380 build begins!
 

Welcome to the club. Is POLO-1 helping? This will be 380 build number #3. Highly suggest you look at Mark H's Cometic head gaskets which are just like the LS1 motors. Also highly suggest pulling the secondaries and deploying Petes Intake cams for an additional 30 HP. GC :cheers:

Re: Secondchance - 380 build begins!
 

Yun,

Welcome to the Stroker family. :cheers:

You will love every second!:dancing

Paul

Re: Secondchance - 380 build begins!
 

And I am sure Pete will suggest his Exhaust Cams too.. just loo at Dominic's thread about that

Re: Secondchance - 380 build begins!
 

Yes. Kevin is helping me identify recommended parts.
I might go to stage 1 cam but prefer not to spend anymore - keeps getting more expensive!
Nonetheless, thanks for the suggestions.:cheers:

Re: Secondchance - 380 build begins!
 

Thank you! Never thought I could come so far...
See you at Carlisle?

Re: Secondchance - 380 build begins!
 

I know exactly how you feel but the intake cams alone are 30HP sitting on the table pretty high performamce to cost ratio. Talk to Pete :handshak:

Re: Secondchance - 380 build begins!
 

Hi Yun, congrats on the build. I am jealous but that is ok among friends. I hope sometime at Carlisle I can get a sample of yours and Phil's power upgrades. Remember the days when nobody wanted a modified car? You have done a tremendous job with that car over the past couple of years, you do the brotherhood proud. Keep us updated on the progress.

Re: Secondchance - 380 build begins!
 

Yun

What a difference 4 years makes! Your car has been
transformed into a show car and now a stroker! Class!

So happy you are going to the next level!! I'm jealous!
Can't wait to get a ride in that beast!

:cheers:

David

Re: Secondchance - 380 build begins!
 

Thanks Ricky! Compliment from you is truly worthwhile.

Re: Secondchance - 380 build begins!
 

Had I not run into you, resulting in hooking up with the WAZOO gang, this would never have happened.

Re: Secondchance - 380 build begins!
 

Yun,

As stated, your car is being transformed into a real "Beast" since you were kind enough to give me a ride back years ago when I visited the WAZOO boys. All I can do is envy all of you. Best wishes in the build and can't wait to hear and see all the details. Yes, I have regrets now about rebuilding mine as a 350.

Craig

Re: Secondchance - 380 build begins!
 

Craig,

U went with Pete's intake and exhaust cams right? What did it dyno?

Re: Secondchance - 380 build begins!
 

Sorry, I wish I did. I have SGC Stage I, both intake and exhaust. I did not dyno yet and still need to get off my arse to put headers back on with new xpipe and Dynomax muffflers with my other chip. I'm done with trying to pass emissions. I really wanna know about dyno too.:cheers:

Re: Secondchance - 380 build begins!
 

What's the spec on those cams?

Re: Secondchance - 380 build begins!
 

> Stage I SGC
> I 228 degs. .416" pri. and sec.
> E 228 degs. .416" pri. and sec

Re: Secondchance - 380 build begins!
 

Ok and Pete's are larger on he intake

237/.425" I
221/.425" E

I think the consensus is that the LT-5 doesn't need much help on the exhaust side. In my case the exhaust cams were good for another 18rwhp and 20rwtq peak. However, it really was the overall torque curve that was significantly improved.

Re: Secondchance - 380 build begins!
 

Dom,

I was given this by Aaron Scott:

STOCK
Intake is split Dur. @ .050 .214 .229 Lift .390
Exhaust Duration @.050 Dur.214 .214 Lift .390

SGC STAGE I

.430 lift with 230 deg @ .050 (both intake and exhaust)

Re: Secondchance - 380 build begins!
 

Craig,

As I posted earlier even the larger cube motors find that the LT5 doesn't need lots of help on the exhaust side. Too big an exhaust and power goes out the exhaust ports. Closing exhaust too late costs compression.

Re: Secondchance - 380 build begins!
 

Dom,
Thanks and that is what I remember hearing. When I mentioned to Aaron Scott he told me that a lot of R&D went into those specs for the Stage I, II, and III, but I don't know enough to talk to him about it more. I am curious to see the numbers it will put down one day and surely not going to take out the exhaust cams at this point. The car runs strong, but I don't have anything to judge it by since anything more than stock feels good. I know when I hit the g-spot it sometimes gets me scared and I am happy with how much power it has, but still not tuned right so waiting for that day. If I were in Texas I would just drop it off at Corey's and if I were up north I would drop it off at Marc's or Pete's. In Japan or Hawaii I'm on my own.............

The only tuning choice I have here is this racing shop: http://www.advanceauto.jp/corvette/pcm.html
They used to show the LT5 on here and my friend here has his car dyno tuned by them, but it costs about $900 US.

Here is a crappy translation from google chrome, but you get the idea.

http://www.advanceauto.jp/corvette/i...apack/0957.jpgIncluding the LS1, LS2, LS6, LS7, I will resetting the engine management various data.
Compare contemplating the difference between driving environment and gasoline with the United States is the country of origin of the Corvette, use conditions, the public, etc., and of using run test in various situations, the chassis dynamometer, the accumulation of data over the long-term It is very popular with the user like after.
Needless of asking the only peak power, it also gives a feeling of power that I did well on in pursuit of feeling in the actual running, and ease of handling.
It is possible setting according to the application of driver-like course.We are tuning shop rather than a mass retailer.
That things instead of using a general-purpose data with little effect, is subjected to a setting directly at the current car did on the highest emphasis on discussion with our customers, to maximize performance is the livelihood of our Advance Auto.
In addition, in the working process, and not in such a way as relying on intuition, and we have been working one by one while looking at the data of the chassis dynamometer.
Of course normal car, even in tuning vehicle change of the intake and exhaust system, engine displacement up, the high cam wearing car, etc., and can be further improved performance by resetting.
When you change, such as after-sales parts and change the lift of the intake system (throttle body and air inter-network system), exhaust system, engine body, the cam, to ensure the achievement of the optimum its performance, APP-DATA is, also, It is a work essential in order to align the status quo of the current car.

Re: Secondchance - 380 build begins!
 

Overall torque curve is THE ticket .

Re: Secondchance - 380 build begins!
 

Congratulations on the new 380 build Yun! Kinda like being pregnant..... .we are all hanging around waiting for the end to hear about the "new baby."

Re: Secondchance - 380 build begins!
 

Thanks Jerry. Once I check what parts I have in the WAZOO inventory I'll be for sure ordering what I need from you.

Re: Secondchance - 380 build begins!
 

Always happy to help out. Glad to see more 380's made=D>

http://i7.photobucket.com/albums/y29...psa843840c.jpg

Re: Secondchance - 380 build begins!
 

Yun,

Depending on which cams you go w, I could have a calibration for you. Been helping out GC w his 380 over the last several months plus tune on my own
motor.

Re: Secondchance - 380 build begins!
 

Fantastic! I'll be grateful!

Thanks for your help with parts list Kevin.:cheers:

Re: Secondchance - 380 build begins!
 

Just saw this.
Here is what I have discovered.

I've tested most all cam combos and have found out the exhaust does not need more them .230 duration and that's on big inch motors with big intake cams.
On a 350 more then .225 is way too much and very hard to tune it does not matter how much fuel you take out the issue is the valve is open so long that it just does not burn all the fuel basicly telling it in simple terms.

This is the reason why most have a hard time tuning with big exhaust cams.

Here are some samples.
441ci runs 10's @ 133+ .247 .470 In .229 .440 Ex (auto)
427ci runs 10's @ 134+ .242 .450 In .224 .415 Ex
441ci runs 10's @ XXX .240 .440 In .224 .415 Ex
350ci runs 11.0's @129+ .242 .450 In .224 .415 Ex

All the big inch motors make over 525 rwtq peak.

All above cars drive like stockers,drive to BG every year they run hard and drive back home aprox 1000 miles and get 25 mpg.

Pete

Maybe more tomorrow,i'm tired.

Re: Secondchance - 380 build begins!
 

For me driveability and durability is most important. Also, trying to minimize cost. I might go with stage 1 intake cam (if I can find one at reasonable cost) but most likely keep stock exhaust cams.

Re: Secondchance - 380 build begins!
 

Yun,
Are you doing anything with the gears or staying with stock ratio?

Re: Secondchance - 380 build begins!
 

At least for now - staying stock. Once the motor is done, then back to front brake conversion followed by coil over conversion. Then, maybe 410 gear. We shall see.
Almost forgot! Two more front speakers in the doors.:cheers:

Re: Secondchance - 380 build begins!
 

Darryl,

Why don't you post a vid of your 380 idling etc?

Re: Secondchance - 380 build begins!
 

Update:

Slight delay due to roof leakage at the shop where the engine will be pulled. Finally scheduled to have the motor pulled around the 28th.
In the meantime I sent a WAZOO spare crankshaft (thank you Phil!) to Ryan Bell (flyin ryan) who is with Rick Watters Racing in Glendale, AZ.
Ryan also helped me with selecting following parts:
4" Diamond 4032 Alloy Pistons 11.5:1 Compression
Diamond 4130 Pins
Total Seal Piston Ring Set - Standard Tension
Eagle ESP 4340 5.850" Connecting Rods

He will offset grind the crankshaft to 2" rod pins, stroke to 3.75", heat treat and index.

I bought main bearings from Kurt (great price!) and sent them to Ryan so that he can check the total assembly before shipping it back.

Once the motor is disassembled the plenum and IHs will be sent to Lee for porting. As for the throttle body, I might stay with 58 mm for now - keeping the cost down.

Ryan has been a tremendous help and took all the guess work out. What do I know... Of course, Phil has been advising me along the way also.

Thanks guys!!!

Re: Secondchance - 380 build begins!
 

All this and you're not porting the TB to save a few bucks? Really?
What's the point of increasing the displacement if you choke it off right at the start?

Re: Secondchance - 380 build begins!
 

I agree why do it at a later date? Is the cost saving really that large at this point? Do you really want down time again after she is all done? Looking forward to the finished product GL

Re: Secondchance - 380 build begins!
 

I would be interested to see if bigger than 58mm really helps......I believe that is between 1000-1200 CFM. Which should support 600hp

Re: Secondchance - 380 build begins!
 

I know guys... I am still thinking how to stage it.
At most hold off for 1-2 months. We shall see.
At his point I just want to be able to drive - can't even drive to Carlisle!

Re: Secondchance - 380 build begins!
 

It's not just a matter of slapping on a larger TB. You'll need to check and probably re-do the Min Air adjustment and calibration. You'll have a different
TPS v for the desired RPM. IAC will be affected. Really should be done as a system. JMHO.

Re: Secondchance - 380 build begins!
 

Keep good notes Yun, if I ever find a motor, I'll be going that route too ;-)

Rich

Re: Secondchance - 380 build begins!
 

[QUOTE=secondchance;180166]Update:

Ryan Bell (flyin ryan) who is with Rick Watters Racing in Glendale, AZ.
Ryan also helped me with selecting following parts:
4" Diamond 4032 Alloy Pistons 11.5:1 Compression
Diamond 4130 Pins
Total Seal Piston Ring Set - Standard Tension
Eagle ESP 4340 5.850" Connecting Rods
Ryan has been a tremendous help and took all the guess work out. What do I know... Of course, Phil has been advising me along the way also.

Thanks guys!!![/QUOTE

That's great Ryan is in the States now. That makes shipping much easier. He will be a Great help in your 380 quest !!

Did you ask him about port work on the it. Not sure if he does LT5 work. Not that he does not know how, it's if he has the time?

Re: Secondchance - 380 build begins!
 

[QUOTE=Polo-1;180280]Porting will be done locally. Prefer to keep anonymous but well versed in LT5. This was much simpler route.