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Old 02-07-2010, 12:28 PM
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what bore should my head gasket be?

hey guys just wondering what bore head gasket I should be buying for my build. Its a 383 bored 0.040" over and I see gasket bores vary tremendoulsy from bores of 4.200" to 4.040". I know the larger the gasket bore the lower the compression ratio is going to be but what is minimum gasket bore one should buy in relation to cylinde bore? I plan on zero decking the block to 9.000" so the pistons are flush with the deck at TDC and getting a 0.040" think head gasket. This should give me around 10:1 compression ratio with flat tops, is the best way to do this? I am just unsure of what the pro's and con's are to say using a 4.160" bore head gasket in a 4.040" block. Please clear this up for me, thanks.

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Old 02-07-2010, 02:45 PM
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All depends on the combustion chamber on the head. Gasket cannot protude on the chamber. It must be completly sandwiched between the block and head. This is what I have been told.
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Old 02-07-2010, 02:58 PM
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Quote:
Originally Posted by V3500
...Gasket cannot protude on the chamber...
This is right, anything bigger than this is a waste. If you put a gasket with
bore that's way bigger than the bore you are increasing crevice space. The
fuel air mixture thats compressed into this crevice either does not burn
well or not at all.
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