Thread: Can I tune out this bog?

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Granted, you're running a pretty big cam, but it the engine vacuum should be a little higher imo.

Is your vacuum gauge connected to full-time manifold vacuum?

Or to ported vacuum which would give you a low reading at a higher idle speed (and zero vacuum when idling 500 rpm or so)?

Originally Posted by C9x

Granted, you're running a pretty big cam, but it the engine vacuum should be a little higher imo.

Is your vacuum gauge connected to full-time manifold vacuum?

Or to ported vacuum which would give you a low reading at a higher idle speed (and zero vacuum when idling 500 rpm or so)?

a cam that has 255 degree's duration at .050 won't even begin to idle at 500 rpm's.