JVS
The intake valves grow 50mm to 58mm.
The exhaust valves about 3mm bigger.
WOW... That's a very big intake valve.
BBC Dart Pro I heads only have a 2.2" intake and that is for a 540" motor. Or in a V-Twin, 135ci.
I think you'd be losing a lot of low end torque with valves and the accompanying intake runners. For around a 1.9L Harley, they're using 58mm TB's. Don't know what size the S&S TB is stock or what you would increase it to. I'm still running a 50mm TB on my 1.8L and it has some good low end torque. My RWHP is 92 and some change on the dyno with 100#/' torque at 2500 rpms peaking at around 115. My motor is only a stage I, re-baffled stock 4" SE mufflers with a tuned controller map.
I wish JV all the best and I know he'll use all the power he can get.
