converted my 235 chevy to pcv. took off road draft tube. installed pcv in valve cover ,ran to carb base. i have a vented oil cap. i was wondering about the slots in valve cover. do i weld them shut? do i leave them alone?
I think you need to put the PCV valve where the road draft tube was. The way you have it now you are not p***ing the air through the engine but merely through the top of the valve cover... not a good system IMHO.
I don't know about anyone else's but my valve cover doesn't have that slot in it. If it did I would have sealed it up. Anything that goes through there, i.e. dirt or water, goes directly into motor. Not a good idea. So yes seal it up.
I punched a freeze plug in where the road draft tube was and and welded a PVC valve in and run it up to the manifold. It does its job. But I don't have any vent on my valve cover I'm pretty sure that only the early ones have the vent
Here is a link about this topic that seems to answer a lot of questions. http://www.chevytalk.org/fusionbb/showtopic.php?tid/234333/
thanks for the link. i guess i needed to research it more. will get another valve cover and try again.
You are over half way home with your PCV installation on the 235.. The easy way is to just mimic a 63-64 230.. PCV in the valve cover, hose to a vacuum port, a vented cap to draw air into the engine and the draft tube removed and blocked off. Weld up the holes in the valve cover so that all of the air has to come in via the oil cap. Make sure you fabricate a baffle plate, installing same about 1/4" below the bottom of the PCV.. No baffle plate... the PCV will **** oil out of the rocker arm area... Use a PCV for a 230 cid six cyln... Bill
thanks for reply , i have done all that except the baffle and weld holes shut. every one seems to think it needs to be hooked up to the draft tube instead. it does make more sense. draw air in at top and blowby from the oilpan area.
The Jalopy Journal
