Small Block & Big Block Chevy Specific - bbc head casting numbers what are they
06-04-2011, 11:10 PM
3994026 rect port i no there from 71 ls6 425 horse 2.19 valve but i see places saying open and closed chamber how do i tell and how can i find out how many cc runner is?
06-05-2011, 09:40 AM
from the mortec website that i found in an archive
3994026....71......rect...OPEN...454 LS6, 118cc chamber
06-05-2011, 01:39 PM
Nhra website lists runner cc specs for all legal heads.
06-06-2011, 09:33 AM
Intake runners are 323 CCs and the exhaust are 127 CCs
06-06-2011, 10:28 PM
Thanks pretty stout set of heads 2.25 intake valves to.
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