Crankcase evac
02-27-2011, 07:42 AM
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MASTER BUILDER
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Crankcase evac
Do I need a evac system on a bb chevy normally aspirated?
02-27-2011, 08:13 AM
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You need some type of evac on any engine. Wether you use a vacuum pump or header evac system or even a pcv valve the crank case has to be ventilated.
TS1955
02-27-2011, 07:47 PM
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Kinda the rule of thumb, if you have mufflers you will need a PVC system, if you run open headers you will need a header evac or vacuum pump.
JMO
Zip.
02-28-2011, 08:34 PM
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you cant run a header evac set up if your running mufflers?
03-01-2011, 06:45 PM
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Originally Posted by billyd21970
you cant run a header evac set up if your running mufflers?
Nope, you'll get the biggest oildown on the engine that you have ever seen. If you are running all out/high RPM.
Been there and done that.
Zip.
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