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Old 06-20-2021, 07:47 AM   #7
Bored&Stroked
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Join Date: Jan 2011
Location: Central Ohio
Posts: 4,979
Default Re: Ford 59A pcv valve... errr

If it was mine, I'd rework the front breather tube (the one that is in the front of the block (inside the valley area) that brings crankcase vapors to the pan vent) to add a pcv valve to it. (Making sure the valve is in the correct orientation - which is not sideways).

The tube can be pulled out of the block and then fabricated/welded to add the pcv valve into it. The top of this tube is then blocked off.

Note: You would probably weld up a 90 degree type of "bung" to the side of it - keeping the pcv valve in the vertical position it is designed to work in.

The reason you want to put the valve here is that it will pull crankcase vapors from down in the lower end (the crankcase) and not just pull them from the valley area.

Then you modify the intake manifold to route a vacuum line down through the fuel-pump breather stand down into the valley and over to the pcv valve. There are lots of ways to do this - it is more of an aesthetic exercise than anything else. You need a larger vacuum line than what is used for wipers. I'd run a 3/8" ID line - similar to what you'd see on a modern usage of a pcv valve. Another option is to route a line through the manifold up front - which requires drilling a hole in the manifold and using a "bulkhead fitting" - where you'd have a hose on both sides.

Yes, the above is a bit more work, but it would ensure that the pcv valve is actually helping pull combustion and water vapors from the lower crankcase area - something that is quite important if you really want it to work.

Good luck!
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