C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Head question for LT1 heads.

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Old Aug 13, 2008 | 11:48 PM
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Default Head question for LT1 heads.

When replacing Corvette head gaskets, do the head bolts require a second torque after a certain period? Thanks.
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Old Aug 14, 2008 | 12:02 AM
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What type of gasket did you use?
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Old Aug 14, 2008 | 12:42 AM
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What kind of bolts too.

torque to yield?
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Old Aug 14, 2008 | 01:59 AM
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not sure, the work was done under warranty about half a year ago and now I am certain that I have a blown head gasket
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Old Aug 14, 2008 | 10:54 AM
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Are you doing it yourself or having the shop do it again?

I just did mine and I've got two obsevations:
Use new ARP bolts, torque to specs from ARP!
Use the permatex sealant on the threads, DO NOT USE the ARP sealant!

I plan to check the torque on mine as soon as I can get some miles on it. Chasing an electrical problem right now.
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Old Aug 14, 2008 | 01:19 PM
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Originally Posted by jaa1992
Are you doing it yourself or having the shop do it again?

I just did mine and I've got two obsevations:
Use new ARP bolts, torque to specs from ARP!
Use the permatex sealant on the threads, DO NOT USE the ARP sealant!

I plan to check the torque on mine as soon as I can get some miles on it. Chasing an electrical problem right now.
What's wrong wit the ARP sealant?
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Old Aug 14, 2008 | 01:48 PM
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Default ARP sealant

Originally Posted by biggrizzly
What's wrong wit the ARP sealant?


I just got off the phone w/ ARP Tech Support & they recommended their non-hardening/telflon-based thread sealant on their head bolts for an LT1/4 engine.
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Old Aug 14, 2008 | 04:20 PM
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Originally Posted by 89FX3


I just got off the phone w/ ARP Tech Support & they recommended their non-hardening/telflon-based thread sealant on their head bolts for an LT1/4 engine.
Thats annoying, then why do they harp on their sealant in their instructions? And that their torque specs are based on using that specific sealant?
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Old Aug 14, 2008 | 07:08 PM
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You torque it to specs and leave it alone. Otherwise you end up stretching the bolt and or threads. The most important thing is to chase the threads and make certain that they are clean and that the bolt goes all the way in by hand without resistance before you goo it up. Also you want to make certaint that the mating surfaces are absolutely true. Then you can't go wrong.

If you blow a head gasket, you have to find out the reason the head gasket blew in the first place before simply putting in a new one.

Good luck!!!
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Old Aug 14, 2008 | 08:44 PM
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Originally Posted by biggrizzly
What's wrong wit the ARP sealant?
It did not seal, after 2 min of the first start my oil looked like a milk shake.

The permatex sealed perfectly and sealed the head bolts right up.
I used the ARP lube on the bolt heads both times I put it back together.

To the poster that said "tourqe them and leave them alone" that will probably work for a street driven car.
Mine spends lots of time at 5000+ RPM so I'll be checking the torque after driving it a bit.

Last edited by jaa1992; Aug 14, 2008 at 08:46 PM.
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Old Aug 15, 2008 | 12:01 AM
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Originally Posted by jaa1992
It did not seal, after 2 min of the first start my oil looked like a milk shake.

The permatex sealed perfectly and sealed the head bolts right up.
I used the ARP lube on the bolt heads both times I put it back together.

To the poster that said "tourqe them and leave them alone" that will probably work for a street driven car.
Mine spends lots of time at 5000+ RPM so I'll be checking the torque after driving it a bit.
Well, I hope mine gets by without this happening. I haven't started it up yet, but I used the ARP Sealant as directed. I wonder if this is common problem with thier sealant? You have me concerened, but I just have a hard time believing that a product that is specifically designed to perform under the conditions we are talking about fails miserably under normal conditions.
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Old Aug 15, 2008 | 04:57 AM
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After two minutes water got into the oil??????

Was there a physical tear in the gasket? Otherwise, you might want to get those heads checked for cracks.

Originally Posted by jaa1992
It did not seal, after 2 min of the first start my oil looked like a milk shake.

The permatex sealed perfectly and sealed the head bolts right up.
I used the ARP lube on the bolt heads both times I put it back together.

To the poster that said "tourqe them and leave them alone" that will probably work for a street driven car.
Mine spends lots of time at 5000+ RPM so I'll be checking the torque after driving it a bit.
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