Pvc Or Breather Big Block - Team Camaro Tech
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post #1 of 7 (permalink) Old Nov 23rd, 05, 12:12 AM Thread Starter
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Pvc Or Breather Big Block

HI just fired up my zz454 crate motor i see its got a breather hole in each rocker cover ,can i just use breather vents or do i have 2 use pvc valve thanks
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post #2 of 7 (permalink) Old Nov 23rd, 05, 03:16 AM
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Re: Pvc Or Breather Big Block

2 PVCs.. 1 in each rocker cover. ..and run your crankcase at a vacuum. Good for power and bad for oil leaks. (that's good for not having oil leaks!)

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #3 of 7 (permalink) Old Nov 23rd, 05, 07:31 PM
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Re: Pvc Or Breather Big Block

Quote:
Originally Posted by victtor
HI just fired up my zz454 crate motor i see its got a breather hole in each rocker cover ,can i just use breather vents or do i have 2 use pvc valve thanks
If you just use breathers, you won't have crankcase ventilation - just pressure relief, with hot oil mist everywhere. As a minimum, put a PCV valve in the driver's side valve cover with a hose to the carb PCV nipple, and a breather in the passenger side cover (a hose from there to the air cleaner base with a flame arrestor is better).

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post #4 of 7 (permalink) Old Nov 23rd, 05, 08:59 PM
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Re: Pvc Or Breather Big Block

Evac

67 Camaro Built with Cubic Money
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post #5 of 7 (permalink) Old Nov 24th, 05, 01:03 AM
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Re: Pvc Or Breather Big Block

Evac will be no good when running mufflers. The exhaust pressure will often be higher than crankcase.
I tried using an evac set up and wondered why my dipstick was being pushed out along with plenty of oil.. ..and yes, the evac was installed in the exhaust correctly.

Nov 68 Van Nuys. 327 floor-shift-auto, Frost Green and not much else when new.

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post #6 of 7 (permalink) Old Nov 24th, 05, 01:35 AM
 
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Re: Pvc Or Breather Big Block

Evac works well with flowmaster race mufflers ,very low back pressure. Make sure check valves in headers are good....they tend to blow out after time. That will send all the pressure back into the motor and will blow oil out of every place possible.
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post #7 of 7 (permalink) Old Nov 24th, 05, 05:22 AM
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Re: Pvc Or Breather Big Block

don't screw around. GM spent a lot of money to have some very smart people engineer the PCV setup.
use it the way GM had it- the proper PCV valve in the driver side valve cover, with either a breather or fresh air tube to the air cleaner on the passenger side.

you don't plan sincerity.
you have to make it up on the spot.

wanna hear about 20 years ago when i was too smart to know any better?
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