Crankcase evac

Old 02-27-2011, 08:42 AM
  #1  
jreiley
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Default Crankcase evac

Do I need a evac system on a bb chevy normally aspirated?
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Old 02-27-2011, 09:13 AM
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TS1955
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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.

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Old 02-27-2011, 08:47 PM
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zipper06
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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

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Old 02-28-2011, 09:34 PM
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billyd21970
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you cant run a header evac set up if your running mufflers?
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Old 03-01-2011, 07:45 PM
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zipper06
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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.

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