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427feracer 02-01-2012 10:26 PM

Cures for excesive blowby???
I have a 302 ford engine I bought new its been sitting forever and I decided to put it in my mustang and its a strong motor but it somehow has blowby coming out of the dipstick tube and the pcv is not fixing it. If I put a crank evac kit in it will it help eliminate this blowby?

SSedan64 02-01-2012 10:41 PM

How many miles on it, Engine breakin complete? Rings seated?
Any idea of Piston clearance?

kleen56 02-01-2012 10:53 PM

You need more than just a PVC. The PVC needs to be connected to the back of the manifold or a plate underneath the carb. The other side of the valve cover needs a breather, or a line going to the air cleaner. You may want to check the PVC as well to see if it's functioning right. Fords need to breath or you'll get blowby..

stinger460 02-02-2012 02:34 AM

it need to breathe more. the engine is closed up to tight. if need be put breathers in valve covers

427feracer 02-03-2012 12:06 PM

I went to the o'riellys and bought two pcv valves and a T and hooked both of them up one on each valve cover. So far no blowby and when i bought the engine it came with four holes in the valve covers two in each cover it had three breathers and one pcv that was not the correct style. i replaced the wrong pcv and so far no blowby! ill get you a picture of the setup.

427feracer 02-03-2012 12:14 PM

1 Attachment(s)
Here is the picture of my setup

tjet 02-03-2012 03:46 PM

If that doesn't work, you can try using 1 PCV valve - see this post

2 PCV valves?

Irelands child 02-04-2012 06:13 AM

One PCV and one crankcase vent is all you need - unless there is something wrong internally with that engine - i.e. broken ring(s), sloppy valve guides. As far as buying a 'new' engine, if it wasn't a Ford or Ford Racing Division engine, it's a remanufactured engine from anyone else. This is a Ford Racing 5.0, and absolutely no blow by in several thousand miles.

PCV side

VENT side

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