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Old 10-02-2012, 11:02 AM
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Originally Posted by dave1969chev View Post
It will idle extremely rough and die unless I hold the throttle, no power at cruise, alright at wot but still not as much as I thought a head swap would give me. I tried throwing a 750cfm on it and it just blew rich smoke and wouldn't hold an idle. But I figured that was bc of the high alt. With my old heads I never had a issue with running a single plane, it behaved on the street.

You have a basic problem like valves too tight or firing order wrong, etc. If the heads are too big, which I doubt, it will just be lazy at lower RPM. It should idle at least as good as it did, especially with more compression.
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