I've searched through the archives and got a lot of great info on PCV systems. Charlie put a sweet set up on his finned covers that I like a lot- I might copy it . But, and I have a HUGE BUTT, I was wondering if instead of blocking of the old road draft tube whether someone installed a breather in that hole, and then put a PCV valve in one (or both) the valve covers to pull fresh air from the bottom of the crankcase and out one/both valve covers?



It seems like a logical way to route a PCV system. If you ran it out of both valve covers you could join them together with a T fitting, and then run one line into the a spacer below the carb, or directly into the manifold. Just a thought that you guys can shoot down for whatever reasons you think it might now work. Or, maybe, just maybe, my frankenstien PCV routing would work....

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie

If you look at a diagram of the PCV  system there is a "flow" to incoming air.In at the oil cap(s) and down through the crankcase purging fumes and then back up through the PCV valve into the intake or carb for reburning.If you installed an "intake" at the roadraft opening(which is what I understand you are suggesting)you dont get the fumes sitting up top under the rocker covers or under the intake manifold.You wont get proper airflow to purge fumes from motor. 

  

My thought was a breather to allow air in at the old down draft tube, and pull it from the top of the motor with a PCV valve at the valve covers, or rear of the oil pan. The vacum on the PCV valves would pull air from the top of the motor.



My only initial concern was the amount of oil mist that's flying around the crankcase. Hence, the breather on the bottom. the PCV valve(s) on top.

Heber City, UT (15 mins outside of Park City- basically it's in the mountains)

55 Effie