The valve cover uses a vented breather cap. The PCV valve draws between 1 - 3 inches of vacuum as described in Deve's post on his site. I verified the amount of vacuum with a gauge.
The Road Draft canister still has the internal oil screen. Being it is about 6 inches taller than Deve's system I suspect that it will at least draw less oil than that.
If anything this setup will certainly work better than a Road Draft tube. At RPM the top of the valve cover would get wet with oil from the breather cap.
The HEI was acquired from a friend that wasn't going to use it. The shaft was modified to work with the 235. It has a hold down that was actually made by HRL, he has told me as much. The problem is the shaft was not machined with the oil grooves as the original distributor has, oil migrates up the shaft and out the opening. The 235 block is machined with a well around the distributor hole to aĺow the original vacuum advance to move. The HEI mounts flush and doesn't close the opening. I made an aluminum collar that fits into the well, the shaft slides through the collar and allows the HEI to set flush with the block. The collar is set into the well using a light coat of gasket maker RTV, the HEI set flush on a gasket asusedon the GM V8's.
Last edited by TUTS 59; 10/11/2024 2:58 PM. Reason: Correction
