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Rob, are those exhaust manifolds you guys run flowed and worked on some? I heard that rumor somewhere that they were even a little lighter than originals.
Thanks!
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Uh, no...that would be the F.A.S.T. (Factory Appearing Stock Tire) class. Our manifolds in Pure Stock must be untouched...we can run a stock reproduction, but they have to be exact copies...and if the repro's are lighter it's news to me...mine are originals, though.
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Rob, what kind of jetting and advance curve did you run in that factory sloppy stock 427 to make the 425 hp. I know that just getting those two in the ball park made a difference that you could actually feel. 20-25 hp? A friend still has his '69 L78 4 speed Chevy Nova. He told me that he went a best of 12.8s with headers, slicks and tuning. He said he was beating on it pretty hard to get there too. How about some real world experiences here.
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Without looking at my notes, I'm gonna guess I had the timing all in by 2500 or so, with total ~37 degrees...jetting was close on the primaries at 73-ish (stock 72/76, iirc) and secondaries 78 I believe? Probably woulda been a *tad* better with my current carb (blocked rear power valve, different jet setup, fresh rebuild from Eric).