My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

I'm working to get my 56' Country Sedan back on the road and many of you have helped so much with insight and all the past threads here. I decided to paint what I could of the engine and get back to the original color. In doing so I had the Valley Pan off and made my own adaptation of the use of a PCV system.

Many of us know there is a kit to convert the valley pan over to PCV through aftermarket pan that has the PCV hole and box underneath with a intake plate under the carb. I made my own using the original pan and few parts I found.

I scored a valley pan from a 332 302 block and cut out the box. I then adapted and fit to my original pan and removed the threaded post in the box. Then determined location of the grommet hole on the pan, about 1.15" diameter give or take using one those hole drill bits used by electricians to install conduit to boxes.

I found the grommet Dorman 42061 and PCV valve Microgard PCV156 from O'Reilly's

Welded the box to underside, sandblasted, primed, and painted. I will block off the road draft on block and already had the carb plate and just need to find the right tube to connect to PCV for the right price.

I feel I was able to duplicate conversion as a whole for about $60 that will work.

Re: 56 Valley Pan PCV Conversion
 

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Re: 56 Valley Pan PCV Conversion
 

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Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

I've seen a couple post on this subject. Any reason the PCV can't be placed in the road draft position instead of the valley pan? seems like a plate with a PCV and a hose to the intake would work. Any thoughts?

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

it would suck oil out like crazy.

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

I don't know about that I put a PCV on a 59 430 Lincoln in the draft tube and
never had a problem.

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

anyone else got any ideas?

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

IMO ... :rolleyes:


The early FYB road draft design was flawed. FORD dropped in 1958 I think. If you want to do a conversion, go with the OEM design.

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

So I found a PVC diagram of a '63-64 Ford F'150 and it appears the PVC set-up just replaces the OEM road draft. So why doesn't that arrangement suck oil like crazy? Appears to be a canister in place of the road draft. Is there some sort of baffles inside to separate the oil from the fumes?

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

At this link, a photo of the valley pan pcv outlet fitting on '63/'64 y-block trucks.
https://www.fordbarn.com/forum/showp...52&postcount=7

There is a baffle possibly with filter media inside it, under the oem road draft outlet fitting. photo

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

In addition, a separate baffle was used (main baffle being shown on windage tray photo). You will see it in the ILL below with BPN 6A665. Also, the OEM setup (LT 292 4V) used a cooling tube which allowed most anything that got past the baffle to cool and drop out of suspension.

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

So what did the OEMs do to keep the intake vac up due to the slight vac leak at the PCV at idle? I guess the idle mixture could be richened but what about at high RPMs. The PCV is open so the vac should be even lower. Rejet the carb, larger venturis? I tried different Ford carbs on my '41 with a Ford 302 with venturis from 1.09" to 1.23" and saw no difference in vac or performance. When OEMs switched from road draft to PCV there must have been a drop in intake vac that they had to contend with

Re: My 56 Homemade PCV Conversion from a 332/302 Valley Pan
 

Manifold vacuum does not drop per sey (redirected from Per sey). :D

The manifold vacuum created is used only to introduce a source of draft to ventilate the crankcase (with atmosphere on the inlet side of the system). Generally with PCV apps, the fuel curve was enriched as the vacuum signal increases air intake. The calibration of the valve and engine speed/load) dictates what the flow amount will be.

Of course, this calibration is upset with neglected service and mileage/engine wear.