Manifold vacume at idle
03-12-2007, 04:52 PM
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Car: 1987 IROC-Z
Engine: 310 lb9
Transmission: SEMI STOCK 700R4
Axle/Gears: 3.45 9 BOLT
Manifold vacume at idle
i fixed the rugulator problem somewhat and starts better now but what vacume pressure should i be running at and what is a good idle in neutral ,now i've got 21 in" -Hg of vacume at idle, and i'm running at 875-750 rpm in neutral if i lower the idle rpm the engine hesitates and oil pressure goes down to almost 15psi or red area.
03-12-2007, 08:05 PM
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Not sure what is the stock reading but 21 sound great to me. I had 18 with my previous non stock cam on stock intake (if that matters) and now have 17 with my XFI268 cam and AFR heads on AS&M/Edelbrock intake. 
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