Quote: Here's a q - what's the effective difference of just wiring the riser valve wide open? Won't exhaust velocity take care of most of it?
Yes, but at this point, 35+ years later, most of them are probably frozen open already.
There's 2 parts to this system. The crossver between the heads that runs thru the intake (which we are discussing) and then the riser valve that reroutes the passenger-side exhaust thru that passage.
In my experience, having no riser valve still allows a lot of intake heating to occur.
I installed the blocked intake pan on one of my cars once and got a *terrible* resonance around 2000 RPM, couldn't even drive the car more than once. (2.5" X-pipe exhaust)
