I am trying to find out what normal vacuum is on a 304. Mine is running 15 right now. All I can find out is that 16-20 seems to the norm for V8's. I installed TBI last year and before that with my 2100 I had 14.5-15 with that set up. I am currently running an Edlebrock non-EGR manifold. Anyone with a 304 have any vacuum numbers?
Pull my finger
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