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Old 08-31-2005, 02:38 PM   #1
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Join Date: Sep 2001
Location: Cincinnati, OH
Posts: 2,028
Car: 87 Iroc Z
Engine: 383ci.
Transmission: WC-T5

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PCV theory and selection.

I'm experiencing some high crankcase pressures. The bottom end has less than 100miles on it after a fresh rebuilt. the rings were reused because they didn't even have 1000miles on them and looked to be fine.
I get no smoke out the rear and it is running really clean. But the pressure leaks oil out the breathers and blows the intake seal at the back.

Would it be better to run a PCV and a breather, or does 2 breathers allow even more ventilation?

If I need a PCV, then which type flows the more air?
I'm running a 383ci carb setup, so i have a good vacuum reference, but will the stock TPI PCV flow enough air to serve the purpose?
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Old 08-31-2005, 02:44 PM   #2
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Location: Rio Oro de Santa Ana, San Jose, Costa Rica
Posts: 19,805
Car: 1984 Z28 Hardtop / 1988 IROC T-top
Engine: 383 Carb / 305 TPI
Transmission: 4L60 / T-5
Axle/Gears: 3.54 Dana 44 / 3.08 10 bolt

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A completely stock PCV system should be fine.
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Old 09-01-2005, 04:44 PM   #3
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Join Date: Jan 2002
Location: Moscow, ID I need my own machine shop
Posts: 3,852
Car: 82 Z28
Engine: Al LT1 headed LG4 305
Transmission: TH350
Axle/Gears: 3.73 posi with spacer

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Any PCV with a breather will work fine.
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Old 09-01-2005, 04:44 PM
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