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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 01:29AM
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
July 17, 2009 09:05PM
You can put on the #13 heads but you will need to use 67 to 78 intake for the runners to match up..
Re: 65 389 70 #13 HEADS
July 17, 2009 09:12PM
and the compression ratio will be different for sure..
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