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Old 09-09-2016, 02:27 PM   #42
davepl
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Join Date: Aug 2006
Location: Redmond, WA
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Re: Idle vacuum - why only 10 inches?

Quote:
Originally Posted by dwcsr View Post
Your cam numbers don't mathematically add up

what is the intake duration and the exhaust duration and the lobe separation angle (LSA)
Here is the actual cam card. It's supposed to be a direct replacement for #3883986, which has an LSA of 115. This is effectively the same cam as the 427/390hp engines. That was a pretty same motor, though lumpier than the 335hp I guess.

I didn't have him go look for his notes, but he degrees the cam on every build and so would have done so on this one too. That's why I'm not too worried about valve timing, hoping he would have caught any mistake in that step. Anything's possible though.
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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

Last edited by davepl; 09-09-2016 at 02:32 PM.
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