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406 sbc RFD 18 degree heads cam 269 281 @.050 450 worth of nitrous pistons .020 in the hole . So here is the question .040 head gasket or .053 ?

.040 = .060 quench 13.02 compression
.053 = .073 quench 12.53 compression
 

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i`d go with the thicker gasket and not worry about that half a point of compression, its not gonna be worth hardly any power on the hose
 

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thinner gaskets conform better to surface and seal better
Dont mean to highjack but this concerns me because I am zero deck and need to run a thick gasket plus I'm running a merlin II block that dont have the extra lifter valley bolts. Any truth to this?

I know I have read Monte say he prefers .040 in the hole and a .040 gasket so I need to go with at least a .073 cometic.
 

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steel or aluminum rods?
 

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Discussion Starter #10
406 sbc RFD 18 degree heads cam 269 281 @.050 450 worth of nitrous pistons .020 in the hole . So here is the question .040 head gasket or .053 ?

.040 = .060 quench 13.02 compression
.053 = .073 quench 12.53 compression
Steve Monte Your thoughts ?
 

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RED ROCKET
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Dont mean to highjack but this concerns me because I am zero deck and need to run a thick gasket plus I'm running a merlin II block that dont have the extra lifter valley bolts. Any truth to this?

I know I have read Monte say he prefers .040 in the hole and a .040 gasket so I need to go with at least a .073 cometic.
.063 cometics on mine.
 

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If .080" quench would be ideal, what about compression? Is 14:1 with .080" quench ok or should a nitrous engine be conservative with compression also?
 

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Dont mean to highjack but this concerns me because I am zero deck and need to run a thick gasket plus I'm running a merlin II block that dont have the extra lifter valley bolts. Any truth to this?

I know I have read Monte say he prefers .040 in the hole and a .040 gasket so I need to go with at least a .073 cometic.
not sure about that thick but .051 seems very common.i would think it would be good as long as everything is flat.
 
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