Can you have 'too big' an intake runner as in it flows too much for your engine to handle and is basically detrimental to performance (similar to the way carbs are).

Some combustion chambers are 64cc and some are 72cc, etc (at least standard on SBCs). Do smaller combustion chambers cause compression ratio to be higher, or what are the reasons for choosing different sizes?

Thanks.

Originally posted by soccerguy045:
Can you have 'too big' an intake runner as in it flows too much for your engine to handle and is basically detrimental to performance (similar to the way carbs are).

Yes! Too big of an intake runner kills velocity (the speed) air flows through it. When that happens the engine gets lazy and low end power dies.

Some combustion chambers are 64cc and some are 72cc, etc (at least standard on SBCs). Do smaller combustion chambers cause compression ratio to be higher, or what are the reasons for choosing different sizes?

The smaller the combustion chamber the higher the compression ratio. 64cc chambers will make your compression ratio roughly 1 point higher than 72cc chambers on a 350 Chevy.

Thanks. Hope that helps!

Is there an advantage to a bigger CC head, assuming the static compression is the same?

Ever drive a Boss 302 Mustang that didn't have a least 4.56 gears? The boss 302 has to be about the worst combo ever to come out from a factory. Way too much port and valve (close to a big port big block)

A 355 with zero deck, .040" gaskets, 76cc combustion chambers and 8cc domes on the pistons will have about 10.5 cr. Trading the 76cc heads for some 64cc heads and trading the domed pistons for flattops (with 4cc valve reliefs) will also get you about 10.5 cr. But the small heads/flattop piston combination will have more efficient combustion and make more power.