makoman1860
New member
I could do a 3 angle valve on the lath.. That should help at the low lift area?
You can modify the valve on the lathe, the seat will require at the very least individual angle cutters but better yet a system that allows you to machine a radius as well as angles ( i.e. serdi, newen, dcm etc). The flow bench is a vital tool here as there is no hard/fast rules and the port design tends to dictate the seat geometry. When I develop a valve/seat set I used a 2 piece valve with a removeable head for easy modification, and I might go through 25-30 iterations before nailing the geometry down. The short turn should have a fairly flat floor for the best low and mid lift flow ( D shape ). Size your intake throat for about 200-225 ft/sec mean port velocity at about 500 rpm below your max track rpm.