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Tappng the intake for PCV valve

 
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projekt70chevelle
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Joined: 13 Mar 2006
Posts: 177
Location: Sanford
5648.92 points



PostPosted: Sat Sep 15, 2018 3:55 pm    Post subject: Tappng the intake for PCV valve Reply with quote

Hello.

So my setup is a 400sbc .040, large cam duration, running an air gap open plenum with a demon which only has the one vacuum port dedicated currently to my brake booster. (i am not going to run a Tee)

I would like to run a proper PCV setup and have a good idea on how I plan to do it with the exception of having a port to attach to...

I was considering the "crankcase extraction kits" but I have baffled mufflers.

With all that said, Im coming to you guys for some guidance/reassurance so that I am not missing something obvious.

1. Is it ok to tap the intake? I've read guys running spacers just to use one port. I'd personally rather tap directly to the manifold.
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Big Dave
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Joined: 04 Dec 2005
Posts: 2656
Location: Tampa Florida
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PostPosted: Sun Sep 16, 2018 12:23 am    Post subject: Reply with quote

Depending upon the carb you have you may have a large tube already plugged that you uncapped and ran a PCV hose to it. Failing in that hole could be drilled through the top of a rear intake manifold runner and a 3/8 NPT tap used to accept an elbow to run the hose to it.

Big Dave
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af2
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Joined: 01 Sep 2003
Posts: 5562
Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Sep 18, 2018 3:21 pm    Post subject: Reply with quote

Tap into the plenum not a runner or you will have oil in that cylinder.
Nothing wrong with a T
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Paul P
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Joined: 15 Aug 2002
Posts: 2425
Location: Townsend, Mass.
82307.28 points


1971 Chevrolet Chevelle

PostPosted: Tue Sep 18, 2018 3:34 pm    Post subject: Reply with quote

Surprised that the manifold doesn't have a plugged 3/8 NPT port on it. Most of them have one behind the carb on the plenum. A "T" will work. PCVs stay more or less plugged at high vacuum and you have a check valve on the brake booster to store high vacuum. Should be fine with that. Up to you of course.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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