LT5 Head Gaskets

[A26B]

Jerrys Gaskets Head Gasket Testing is Sucessfully Completed

Testing was performed on a stock, 90 model, 375Hp engine over a two day period.

I have placed an initial stock order for 50 LH and 50 RH head gaskets, which should be available for immediate shipment on Oct 7th.

J/G head gaskets can be purchased individually but should not be installed in conjunction with any other type of head gasket as differences in compressed thickness will result in un-equal compression between cylinder banks.

Pricing is $79.75 per gasket. Gaskets are individually packaged.

A technical data sheet and installation guide is being prepared and can be viewed on the J/G website when the gaskets are in stock for sale.

Thanks to everyone and all of your support. Without you, J/G would not have been able to develop the head gaskets, as well as several other new parts that are in critical short supply or no longer available.

J/G has also developed and ordered into production, Cam Sprocket bolts and Valve Spring Seats. Both items are improvements on the OEM part, made from higher strength alloy steel.

Cam Sprocket bolts were specially made to duplicate the OEM design with a tall, 6pt hex drive to better facilitate torque-angle tightening during the cam timing procedure. Availability is expected around Nov 25th.

[-=Jeff=-]

Sept. 7? Or do you mean Oct?

otherwise congrats on the successful test

[A26B]

Originally Posted by -=Jeff=-

Sept. 7? Or do you mean Oct?

otherwise congrats on the successful test

Why of course I meant Oct 7th!!

(thanks)

[tpepmeie]

Originally Posted by A26B

Jerrys Gaskets Head Gasket Testing is Sucessfully Completed

Jerry,
The icon just isn't big enough. Many thanks for pulling this off.

Todd

[-=Jeff=-]

Originally Posted by A26B

Why of course I meant Oct 7th!!

(thanks)

No Problem, Sept 07 is a long way off now

[White Bullet]

That is great Jerry. Without your support we would be in deep ###t. You are the man.

[Paul Workman]

Originally Posted by A26B

Jerrys Gaskets Head Gasket Testing is Sucessfully Completed

Testing was performed on a stock, 90 model, 375Hp engine over a two day period.

I have placed an initial stock order for 50 LH and 50 RH head gaskets, which should be available for immediate shipment on Oct 7th.

J/G head gaskets can be purchased individually but should not be installed in conjunction with any other type of head gasket as differences in compressed thickness will result in un-equal compression between cylinder banks.

Pricing is $79.75 per gasket. Gaskets are individually packaged.

A technical data sheet and installation guide is being prepared and can be viewed on the J/G website when the gaskets are in stock for sale.

Thanks to everyone and all of your support. Without you, J/G would not have been able to develop the head gaskets, as well as several other new parts that are in critical short supply or no longer available.

J/G has also developed and ordered into production, Cam Sprocket bolts and Valve Spring Seats. Both items are improvements on the OEM part, made from higher strength alloy steel.

Cam Sprocket bolts were specially made to duplicate the OEM design with a tall, 6pt hex drive to better facilitate torque-angle tightening during the cam timing procedure. Availability is expected around Nov 25th.

Great news, Jerry!!

And btw, your valve stem seals seem to be top notch as well. I've been cycling my LT5 a bit, and there isn't a bit of smoke on fire up, even after sitting for a week! Thanks for all you do for all of us!!

P.

[A26B]

Thanks all.
BTW, I've put the gaskets up on the website, along with the Tech Data Sheet. If you see anything in the data that looks odd, let me know. Photos of the gaskets are up too.

[shaynezrl]

Jerry, Thank you for all your effort. One more part i will ad to my collection soon.

Shayne

[A26B]

Originally Posted by Dynomite

When the stress is sufficient to permanently deform the metal, it is called plastic deformation. This applies to camshaft sprocket bolts.

Now having said that.....what is the relationship between bolt torque, thread lubrication, and bolt tension?

The preload on a bolt, when determined via the torque method, can be off by as much as 25% even with proper precautions being taken especially between lubricated and dry bolt threads.

The purpose of bolt thread lubrication is to ensure that the applied torque deforms the bolt along its axis (stretch) instead of around its diameter (twist).

I have seen a statement that the standard for thread lubrication is a light coat of oil of about 10W viscosity. A thin coat of most engine oils does just fine. The idea is to allow the threads to move against one another and light oil does that reliably. Of course, this standard assumes that the threads of the bolt and nut, or case, or whatever, have reasonably smooth finishes. Exotic or extreme-pressure lubricants such as gear oils or moly pastes are mostly a waste of time and can actually be harmful if they reduce friction too much.

I on the other hand for oil pan bolts and other bolts on engine components such as the water pump, front engine cover (especially threaded into aluminum) use blue thread locker which by itself is a bolt lubricant. I clean and dry the bolt hole and bolt threads (I use a fine wire wheel on bolt threads including head bolts) with gasoline on a que tip for example cleaning out debree and oil films as much as possible. This applies to head bolt threaded holes as well.

You can reuse head bolts but I prefer to use new head bolts since I have no clue how they were first installed. It also depends on how hard they were to remove.

So.....the debate is not if you can reuse head bolts but rather should you use any kind of lubricant or sealer such as permatex gasket sealant when you install the head bolts

I use a light coat of permatex gasket sealer on the head bolt threads which it is my thinking will help prevent corrosion and bolt locking next time I want to remove a head bolt.

The permatex gasket sealer displaces moisture and oils that might remain or find there way into the threaded hole receiving the head bolt. The permatex gasket sealant (wipe the thread with paper towel so coating is very thin) assures consistant bolt torque/bolt tension relationships.


What say you

I say.... follow the GM Service manual. The LT5 engine was engineered by some of the best in the world. If they recommend a light coat of oil on the head bolts, then I think that's what should be done. As such, I don't see a debate here, nor do I concur with the use of permatex on the head bolts.

I am concerned that the post "pointed to" in this thread by "Solutions" may mislead a casual reader. I would recommend that the point to Dynomites post be modified to the entire thread instead, so that the reader may form his decision objectively, based on the reading of the entire subject matter.