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Old 12-14-2004, 09:48 PM
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compression ratio question

alright im building a 350 SBC no need to get into all the details i just need to know what my compression ratio will be with this combo alright first off the bore is .040 over (4.040) still standard stroke, the piston has a .125 solid dome, the block has been zero decked and the head gasket is just a normal fel pro (4.03 head gasket bore, .021 compressed head gasket thickness most likely) and finally the cylinder head combustion chamber is 72CC's thanks for all the help over the last year guys, one more quick question do you guys think ill have anything to worry about as far as valve to piston clearance with this setup, the pistons have two valve reliefs and the cam specs are adv dur 294 deg intake 300 deg exhaust gross lift .502/.516

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Old 12-14-2004, 10:04 PM
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Always check for valve to piston interference with domed pistons and ditch those gaskets since the block has been zero decked. Use gaskets that are at least 0.035" thick or you'll be whacking the heads with the pistons very quickly.

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Old 12-14-2004, 10:17 PM
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A flat top piston and smaller chambers would be a better option if, you haven't already bought the parts you listed. Larry is correct about the head gaskets.

You should not even be close to having piston to valve clearance problems but, it is always good to check. At your lift level you shouldn't be close but, valve timing plays a big role as well.

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Old 12-15-2004, 12:54 AM
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A dome piston is an airflow restriction. Flat top pistons flow better. Always try to increase compression at the head.
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