[Chevysrule454]

Hey youall.Im Darren Betker from Dryden Ontario Canada, and i know i may not fit in here due to the direction of my particular hobby( off roading) but we all share a common interset....engines!!! Currently im putting the final touches on my 1986 chev blazer k5, with 1ton axles gears and lockers, 489 BBC, TH4oo full manual/reverse valve body, NP 205 transfercase,44inch boggers, winch etc, and was wandering if anyone can tell me what comp. ratio i can expect when i put a set of '6781" Chev cast iron oval port heads ( which iv heard either have a 119 or 113cc chamber) up against a set of KB "ICOA" 23cc dome fordged pistons. Im aiming for a 10 or 10.5-1 ratio but a little higher is ok.please help as the moter will be going in very soon and id like to have that info before it sees its first tank of feul.
Thanx Darren

[cobalt327]

Welcome aboard, answer to question see other identical thread in engine section.