PCV in the intake revisited

I love it! It seems that 15 of every 10 Corvette motors ever made are alive and well and living in a hot rod!

 

SSSHHH don't tell anybody and maybe they won't notice. But sorry no part numbers (can't admit I know) but most engine models had them at one time or another that was screw types. Go to the local napa or whatever store you have where the guy behind the counter is willing to grab a few and let you look at them. Some are plastic some metal.

 

Sorry it took a bit to remember (old guy and all) this but this guy is very good and he may have found the solution to your problem. And it's from a Pontiac not a rice burner. Click the link and go to the very last part of the article and there it is from a Pontiac OHV.

http://www.webrodder.com/article.php?AID=534&SID=24

 

This is what i generally use,I worked for chrysler corp for 20 years.In 90 or so the vacuum was at the threaded end,Great for under the manifold uses.Put a 90 degree fitting and allow it to **** from the vally.I have welded a alluminum cover around the barb end to sheild oil splash and its been working great for several thousand miles.
Prior to 90 they placed it in the valve cover,it has a br*** extention out of the threaded end and vacuum is applied to the barbed end.
They did this to eliminate condensation build up in the pcv by keeping it close to the engine where it will stay hot.
As far as size of the engine goes,a larger cam and low idle vacuum will warrent a smaller orifice.
A pcv is a controlled vacuum leak so under accel it becomes useless and at idle it can be too large so idle quality will never be seen.
Any doubts if your pcv is too large with a aftermarket cam just block it off and if it runs much better you should be able to achieve the same idle when it is hooked up with your mixture settings.
If you cannot chances are your pcv orifice is too big.
Its pretty simple but commonly overlooked.
Hope this can help someone out,Gary

 

I run them on my race engines as well. Only issues everare if using total seal rings and then we make a small restictor in the PCV line to keep thing from getting too efficient. Tis fun though to see other racers freak out when theys ee an 8 second rail running a PCV.
Don