I'm tuning a 385 with the CC XFI 218/224 cam and the idle is rougher than expected. Thinking I have a vacuum leak on the intake. Anyone have an idea what a normal range for manifold vacuum at idle would be at idle with a cam in this range?

Thanks, Michael

 

When I had my gm846 cam my MAP read ~14-15 (222/230 112lsa) so it should be similar than your cam in a 385.