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Original Message
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| RE: 390 vacuum diagram? |
| By walt - 04/16/2005 5:03:59 AM; IP 68.42.151.124 |
| check your vacuum booster on your brakes.or and carb base plate leak//warpage,may be an intake leakyou should have at least 17 hg(inches)at approx 650 rpm,also the vacuum drops at the dist port on the carb when you open the throttle,rev the engine up.and shut it down,listen for a sucking sound,when the engine stops,if you don't hear one,and vac is still low,check your intake manifold,milled heads,or milled manifold,cracked head/manifold.or pvc.hose connections |
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