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65 389 70 #13 HEADS

Posted by g.p.44 
Pontiac GTO Masthead

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65 389 70 #13 HEADS
September 26, 2008 01:28AM
will 400 heads work 389 stock bore will i loose H.P.? iam kinda new to the 389 thanks for any help
Re: 65 389 70 #13 HEADS
January 11, 2009 04:49PM
That depends on C.C. size of the head. send me the casting number from the center exhaust ports ie: 6X,7H3 etc.. and I will tell you cahmber size.
Re: 65 389 70 #13 HEADS
January 11, 2009 05:02PM
Sorry didn't see top of post DUH!!!
This combo should be great !!!

cast year CID HP in ex cc

13 1970 400 330,350 2.11/1.77 72 AT Ram Air III
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