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Hi all. I have a 493 shortblock that I plan to bolt 84cc edelbrock heads (out of the box) onto, along with a performer RPM intake (willing to change if needed), 950 CFM carb. The compression is 10.3:1 with the heads and .039” gasket.



Small headers (1 5/8 schumachers, but I’ve seen people run 10.8 with them so I’m not considering them too bad of a handicap).

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With the 493 they will be a handicap, IMO No big cam for you. You need a smaller cam, like the MP 528 or similer that works well with a restricted exhaust.

Even with that said, you should still be able to run into the tens with a A-Body and your 10.3 comp. and 493 combo. I just wouldnt throw alot of cam at it.


EDIT; Dave, I just bumped up a post for you from 2013 in "Question and Answer" Its Titled , "Best headers for a street 440" Check out Skeptics link, "This Test" A comparison between 2" headers and the Schumacher tri,s. o a 451 and MP 590 cam.