VCCA Home Forums TECHNICAL - 1945 AND NEWER 1946-1948 PCV addition to 216/235"

Has anyone added a nice "NEAT" PCV system to there 216/235" engine? That road draft system is pretty stinky and inefficent.Pictures would be great

Chevrolet offered anoptional PCV system and was standard on some trucks, especially for those used for door to door delivery.
It is pictured in later shop manuals....I believe it was first offered in 1948.
Could send you apicture from a later manual but will need your email address.

A VCCA Chat post dealt with adding PCV's a while back for those with excessive blowby or folks that wanted to ditch the road draft tube. The link is HERE.



The Deve's Truck article listed in the article is HERE.

While the simple system pictured may work on some engines but there are other things to consider.
On a 1947 how would oil be added?
On a 1947 (or up through 1954) engine it would be pulling in dirty air through the vents in the valve cover.

Would be necessary on a 1947 to use a 1949-1953 valve cover, plug the air intake vents and use a 1955 and up oiled mesh vented oil filler cap.

Also with the vacuum pulling air out of that location it will be pulling out some oil also.
The Chevrolet version used a more or less conventional vent tube with baffles, ect. but blocked off so no incoming air could enter as it got its air (filtered) through the air cleaner.

Additional discussion of this topic was covered in a post I made on 7-17-13. It was titled, "Update on 41 Rear Seal and PCV valve." I can post a picture of the valve I installed on my plugged draft tube if it would be helpful. I do think the time and energy I spent on trying to eliminate a rear seal leak by this method was a total waste of time. Here is what I said at one point in discussing this topic:

"As I understand it, when I talked with the shop foreman that did my rebuild, he stressed that the PCV system works only with the right size PCV valve and the correct mixture of vacuum to fresh air. If there is too much fresh air entering through the valve cover vents or an unplugged breather tube then the thing doesn't work.

I am suspicious about the postings of those who have adapted their cars/trucks to PCV venting. How did they do their engineering to establish the right vacuum/fresh air ratio. Plugging up the breather hole in the block, or the breather tube does eliminate the possibility of oil leaking from a breather tube but is it really recirculating crankcase gases back into your intake manifold?"

More dicussion on this topic is included in this link. Update on 1941 rear seal and PCV valve

Good luck, Mike