Quote:
Originally Posted by SD455DJ
Very cool ‘69 GP, and especially the 428HO’s. Well, unfortunately, you can’t run it at the Pure Stock Drags, the event in Michigan, anyway. There are other “pure stock” style races around the country where as long as it looks reasonably stock (no aluminum heads, aftermarket intakes, Holley carbs, and headers) your able to race. The F.A.S.T. rules pretty much let you do any modifications under the engine paint as long as it looks factory, but if they have a savvy tech guy, they may spot the RAIV 722 heads and just let you run time trial passes. Their Factory Stock class pretty much follow our rules (PSMCDR.org), but they may let it go as they are pretty lax about correctness a lot of the time.
Your D-port #62 heads are good as is the cast iron intake and give nothing up to a RAIV top end in the lower rpm range (idle to 3500 rpm). You need low end torque to move your relatively heavy GP and the 62’s will help there. With at least 10.0 to 1 compression, the 2802 cam (224/234/114 at .466”/.488”) is a great choice with Hy-Lift Johnson lifters. You’ll make the 16” Hg at 1200 rpm easily and your 3.55’s would work well a small converter. Any RAIV clone cam is not going to pass the 16" Hg. minimum and have a reasonable sounding 'stock' idle.
Dennis
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After talking to the friend of mine tonight who is building my engine, the 722s will have to be cut to around a 66 cc. The piston I'm using have a 14 cc dish, and not enough to kill off some compression, so it looks like the 62s might be what i'm going to use after all.