Putting my top end back together. Stealth heads are now CNC ported. In the past, the stock stamped valley pan worked just fine. Now the port windows are larger, so the stamped valley pan is out (I believe). So I’m soliciting experience from what others have done.
My assumption is to cut the intake gasket portion of stock valley pan off, leaving a short tab at the bend. Then silicone the joint from that to paper gaskets cut to match the port. (????). Am I close?
What have others had success with?
When a stock valley pan is cut and "bat wings" are used to seal the intake, my experience has been not if it will leak, it's when it will start leaking. Especially the rear corners. I have had little to no issues using the stock valley pan and trimming the intake ports with a high speed Christmas tree shaped double cut carbide bit. If the heads are off I bolt the valley pan to one head, align the pan and cut the pan to match the intake port on the head then switch to the other head. Done
If the heads are already installed, use a thick bat wing intake gasket and align the gasket to the valley pan, outline the metal on the valley pan that needs to be trimmed with Dykem or a Sharpie, remove the bat wing gasket and trim away.........
