head gasket failure, mls option?

[10secTy]

Re: head gasket failure, mls option?

If you use the non mls gaskets make sure you retorque them or you will be changing them again down the road.

We also over torque them. Stock nombers are 65 I belive and we go 70-75 I even know some guys that went to 85 but thats pushing it.

Nolan

 

[Tooky]

Re: head gasket failure, mls option?

If you use the non mls gaskets make sure you retorque them or you will be changing them again down the road.

What's behind this? I just had a premature head gasket failure with OEM gaskets and I couldnt find the cause. However I doubt the factory retorqued and my factory head gaskets lasted forever and when I pulled them off (to swap Vortecs) they looked flawless.

We also over torque them. Stock nombers are 65 I belive and we go 70-75 I even know some guys that went to 85 but thats pushing it.

Nolan

What's behind this? ARP's instructions say their slick moly lube lowers the necessary torque values. I followed their instructions which said 65# (same as SyTy factory service manual) but apparently 65# with the ARP moly lube is more stretch than you'd get doing factory head bolts with no lube.

After contacting ARP following my HG failure, they said I could go up to 70 or 75 but that it shouldn't be necessary. I went with 65 again and will see what happens. But now you have me thinking about a retorque. Its extraordinarly labor intensive to remove the turbo, downpipe, crossover, manifolds, upper end etc. to access all the head bolts.

 

[10secTy]

Re: head gasket failure, mls option?

I have done it more times than I care to remember. That was the only way to get teh heads gaskets to last. Before the mls gaskets where a option the felpros where teh hot ticket. Well after pushing one I did some researcha and found alot of sprint cars where pushing the gaskets as well and felpro changed the instructions to do a full retorque. So I followed that I found and my felpros held great to some very high boost.

So now unless its a mls I retorque period. Oh and we check alot of mls gaskets to make sure when they come off the engine dyno and they do not move.

Nolan

What's behind this? I just had a premature head gasket failure with OEM gaskets and I couldnt find the cause. However I doubt the factory retorqued and my factory head gaskets lasted forever and when I pulled them off (to swap Vortecs) they looked flawless.


What's behind this? ARP's instructions say their slick moly lube lowers the necessary torque values. I followed their instructions which said 65# (same as SyTy factory service manual) but apparently 65# with the ARP moly lube is more stretch than you'd get doing factory head bolts with no lube.

After contacting ARP following my HG failure, they said I could go up to 70 or 75 but that it shouldn't be necessary. I went with 65 again and will see what happens. But now you have me thinking about a retorque. Its extraordinarly labor intensive to remove the turbo, downpipe, crossover, manifolds, upper end etc. to access all the head bolts.

 

[Tooky]

Re: head gasket failure, mls option?

Hey thanks for laying that out for me, I guess I have to weigh out the time to do a retorque vs the time to do another head gasket R&R if I suffer another premature failure.

BTW how long does it take you guys to do an engine dyno on one of these things? Seems like it would take an eternity to setup and tear down!!

 

[10secTy]

Re: head gasket failure, mls option?

It takes about 1.5-2 days start to finish. We have a stock harness I have cut down and removed all the junk for the dyno.


Nolan