Which head gasket do I need to lower compression
11-16-2014, 01:54 AM
#1
Staging Lane
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Which head gasket do I need to lower compression Hey guys recently I blew my head gaskets on my car and I want to do a bit of extra stuff since I'm doing all the work I wanted to know which head gaskets I need that are thicker than the stock ones so I can lower compression I want to lower the compression so I can have a bigger shot of nitrous
11-16-2014, 08:52 AM
#3
The stock gasket is already rather thick and using a thicker one to lower compression for nitrous is just an expression of pure ignorance.
Long as there is no boost involved you should be looking at if anything a thinner head gasket. Nitrous loves compression. The stock 10.4 compression ratio is very conservative for NA and nitrous.
The stock LT1 can be fairly happy on nitrous to say 150-175 shot if the tuning is OK but seeing as you popped a head gasket and think thicker is the answer I will go out on a limb and say your ignorance lead to a bad tune and the popped gasket.
Get the heads checked for straightness, the stock gasket is .049, felpro has one that is .039, Mr. Gasket/Victor Rienz has a .026. The stock shortblocks has the pistons way down in the hole so good quench won't happen, the .026 is the easiest way to try and improve that, but the Felpro is easier to find. No way in hell would I consider stock or thicker for a stock shortblocks NA or Nitrous.
Long as there is no boost involved you should be looking at if anything a thinner head gasket. Nitrous loves compression. The stock 10.4 compression ratio is very conservative for NA and nitrous.
The stock LT1 can be fairly happy on nitrous to say 150-175 shot if the tuning is OK but seeing as you popped a head gasket and think thicker is the answer I will go out on a limb and say your ignorance lead to a bad tune and the popped gasket.
Get the heads checked for straightness, the stock gasket is .049, felpro has one that is .039, Mr. Gasket/Victor Rienz has a .026. The stock shortblocks has the pistons way down in the hole so good quench won't happen, the .026 is the easiest way to try and improve that, but the Felpro is easier to find. No way in hell would I consider stock or thicker for a stock shortblocks NA or Nitrous.
11-16-2014, 02:37 PM
#4
Staging Lane
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Well my head gasket didn't go because the nitrous and I asked because I have a friend with an ls1 that did the same he got a head gasket from an ls2 so it was thicker and he now runs a bigger shot of nitrous it did kill horses all motor but it made it love the nitrous
11-16-2014, 05:28 PM
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What he said ^^^. Lowering your compression goin to drop hp on motor and the bottle. You need to run a .026 gasket when u put it back together. Only reason to ever lower compression on stock or mild built motor. Is to run boost.
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11-21-2014, 10:09 PM
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loving all the Fast and Bicurious references! By the OPs account, I did my 396 lt1 all wrong being 12.3:1 SCR @ zero decked & .030 gaskets and a 200 shot. I guess that was a waste of a $13k build. N2O isn't boost, get that CR up to somewhere useful. Hell even stock CR isn't terrible with reasonable boost and proper tuning. 
11-29-2014, 10:04 AM
#18
I thought it was the intake manifold welds that would blow. But that isn't the way vins father got killed, anyway. He got it in turn 2 of a pro stock race (you know - the return road to the pits)