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Pontiac of the Month

31pontiac's 1959 Bonneville

2019 December
of the Month


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About Yahnke

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    Fresh Meat

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    Drag racing,cruising,shows

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  1. Thanks Frosty for your reply,but you misunderstood my question anyone tried these?? Now if you want to give me a price on your 7k3 heads i would by willing to buy them. since there is an abundance of Pontiac heads in your area . What i want to do is put them on my 73 GP, and I dont want to go through alot of port work. these heads are the ones I have . and they have better velocity with a 181 cfm at .500 lift than any of the heads like 6x, 96 ,66,64,48 do you see my dilemma?? So i pretty much can see no one has tried this, I will keep you posted on the outcome
  2. Been checking with all the experts on which heads are best for a 455...6x???why are these so popular ? seem to have better low speed port velocity but lees velocity than my 4x at maximum lift..talked to my machinist said maybe try a set of 46 heads off a 350. has better high lift velocity than the 4x and the 6x with a 96cc chamber volume.He suggested replacing intake vales with 2.11 and installing screw in studs which could also improve low speed velocity. has.anyone tried this combination? would appreciate any advise
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