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Old 04-24-2018, 11:14 AM   #17
davepl
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Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
Re: Big Block - possible timing issue (?)

How'd you know it was an L36? We made 402 against a rated 390. That's stock blueprint factory cam, stock everything. It was punched out to 0.060 over, which is 3%, and made 3% more power than stock, so by that metric was -perfect-. 498 lb-ft but just couldn't crack 500!

Then I'll stick an air cleaner, iron exhaust manifolds, accessories and mufflers and it'll make 275 net at the wheels or something like that!

It breaks up at the end of a long run when it sucks the float bowl dry, so we're trying to find a bigger needle and seat. Worked OK at 6.5psi with an electric pump but the mechanical couldn't keep the bowl full with the stock needle and seat. That would have been a bear to sort out in the car!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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