Quote:
Originally Posted by Kenth
"It would make sense the 66cc 48 heads may have been originally intended for the 350 engines and somehow ended up on the 400's. It makes no sense they wanted a d-port 400 to have more compression than the top dog RAIV engine."
Still, they put 66cc #12 heads on the second top dog 1970!
It wasn´t compression alone that made the RAIV faster than the RAIII either year.
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Agree and that still doesn't make sense. If one ordered the right options on a RA III it would hold its own against a poorly optioned RAIV.
By chance would you know if both engines used the same head gaskets or know the GM part numbers for them?