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crankcase vent- back of the block or valve cover??

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Old 04-03-2011, 05:03 PM
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Default crankcase vent- back of the block or valve cover??

well ive been running the 2 fittings on the back of the block to my catchcan for the past few years. it occasionally pushes some oil into the catchcan. recently i came across an extra valvecover and had a friend weld 2 -10 bungs in it. i also drilled out the spotwelds on the baffle and removed it as it was right where the bungs went.


should i switch to the valvecover vents, even though the hose is a little bit smaller with the -10 than the hose i have currently to the back of my block??
Old 04-03-2011, 05:27 PM
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Default Re: crankcase vent- back of the block or valve cover??

i would keep the vc with the bigger hoses
Old 04-03-2011, 10:33 PM
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Default Re: crankcase vent- back of the block or valve cover??

have a nice day

Last edited by vwbased; 01-27-2013 at 09:01 PM. Reason: have a nice day
Old 04-03-2011, 10:59 PM
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Default Re: crankcase vent- back of the block or valve cover??

baffles are a BIG benefit. learned this back in the day on an old 350. without them you spit a LOT more oil out
Old 04-04-2011, 03:32 AM
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Default Re: crankcase vent- back of the block or valve cover??

I found having valve cover vents somehow equalise the pressure and stopped the oil from filling the catch can from the rear block breathers.
Old 04-04-2011, 03:18 PM
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Default Re: crankcase vent- back of the block or valve cover??

Originally Posted by vwbased
You are going to need to reinstall the baffle in the valve cover. The added vent bungs need to be above the edge of the baffle.
i think i still have the baffle in my trashcan. i can take it back out and clean it off and tack it back in place. i took it out because i put the bungs on the back of the cover, not the front. it was kinda in the way of the drill when i put the holes in
Old 04-05-2011, 04:48 AM
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Default Re: crankcase vent- back of the block or valve cover??

Originally Posted by EddieCRX
I found having valve cover vents somehow equalise the pressure and stopped the oil from filling the catch can from the rear block breathers.
So you're saying if you put vents in block and in the VC it doesn't collect as much oil?? I'm asking because I plan on venting the back of the block with the Z10 kit. Thanks
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