M1 Tunnel Ram Top Plenum Volume Reduction with Photos

Pretty close because based on those numbers if I’m right about the intake length peak would be 5850, cam would influence it too. But appears to be pretty close. You could always shorten the length by milling the base where the top bolts but then there’s no turning back unlike adding a spacer lol
After welding on it and fitting it to my decked heads I had removed about .200, I don't want to surface that thing again... pain in the butt lol