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The oily mess that gets pulled from the draft tube will likely pool up in the convoluted plumbing you'll have to cobble together to route to the vacuum source. Don't do that.
Block off the draft tube.
Either find a later valley cover or modify a valve cover for the valve routed to the PCV port of yor carb.
Use a vented filler cap.
Done.
You might be able to seal off the draft tube port on the manifold with a freeze plug. Or, use a test plug of the appropriate size, they already have MNPT threads, so one hose with an in-line PCV valve back to the carb base. No convolutions involved, and no holes in the valve covers.
The oily mess that gets pulled from the draft tube will likely pool up in the convoluted plumbing you'll have to cobble together to route to the vacuum source. Don't do that.
Block off the draft tube.
Either find a later valley cover or modify a valve cover for the valve routed to the PCV port of yor carb.
Use a vented filler cap.
Done.
I'd follow the method Steve has laid out. If you're concerned about modifying your original stock valve covers, either use a later valley cover or get a set of aftermarket valve covers to work with and save the originals. It makes sense that oil would puddle inside some kind of hose or tubing from the road draft tube to the base of the carb.
There won't be any puddling of oil anywhere unless you have very poor vacuum, and there is no oil baffle used. The puddled messes you have seen are due to plugged PCV valves, where the crankcase pressure is pushing the condensated mist out. And really, I wouldn't touch the valve covers.
There won't be any puddling of oil anywhere unless you have very poor vacuum, and there is no oil baffle used. The puddled messes you have seen are due to plugged PCV valves, where the crankcase pressure is pushing the condensated mist out. And really, I wouldn't touch the valve covers.
Don't know anything about this stuff either, but I'm paying attention. You know MM, there are people who charge for this information. Thanks for the lamp info.
The environment in the crankcase behind the draft tube on the lower block is going to have a lot of oil in it and is not a suitable place for the valve to pull from. I used the valve cover location as in the photo because that's the way my '56 was set up when I inherited it from my Uncle in 1990. We live in Califonia, and by the late 60's or early 70's it had been fitted with a valve cover mounted PCV plumbed to a spacer under the old two-barrel. It was probably required. I rebuilt the engine about 15 years ago, and at the time I didn't know about the later valley cover that has the PCV valve located at the back with a baffle box underneath. If I had, I would have used one. I'm running an Edelbrock carb and an air cleaner from an 80's T-Bird that uses a breather filter inside the air cleaner housing. I found a filler breather with a hose connection and plumbed it over. This works well for me and I have no leaks or blow by odor. Of course you are free to plumb the PVC system anyway you like. Personally, I'm not worried about originality, and my goal is reliable, trouble free operation- thus the electronic distributor, 3-wire alternator, a hi torque starter and yes- a PVC system that if I had to drill a hole in a valve cover to install, I'd drill one.
Steve I agree with you. My truck is far from original. So the valve cover was drilled before and pcv installed? But I have to ask where the pcv valve is does it interfere with the valve train? And I thought I read that you need some baffle under pcv valve? But if it works and no problems I’m taking off my valve cover off and trying it. But the draft tube I have has a fitting on it. I was thinking of routing a hard line similar to Chevrolet running a hard line from the intake to a automatic transmission.? What do you think.?
thanks
jerry
No interference with valves. The "baffle" is a simple 3-sided box welded to the underside of the valve cover and seems to work partly because these engines don't have a ton of oil up there anyway. But try your idea. It's all an experiment.
I think I’m going to pull valve cover soon and take a look. The real reason I want to delete the draft tube is because of oil seeping out of it. But once I tightened up top of breather it seemed to slow down leak.
thanks
jerry
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