273-106.9326 with a 1.78 valve
318-103.4599 with a 1.78 valve
340-104.8796 with a 2.02 valve
360-101.6965 with a 1.88 valve
408-100.7280 with a 2.055 valve
I always round down and make sure I have enough duration to carry the RPM I want.
You can’t use these numbers if you want a flat curve after peak HP. You have to open the LSA up for that.
Thanks. I tried doing the math while on a short break from working on the truck. I didn’t come up with numbers that made sense so I did something wrong. So, frustrated & hot, I just left it to do some parts gathering.
Rounding up-ish…
A 273 will use a 106.9326 with a 1.78 valve - 107
A 318 will use a 103.4599 with a 1.78 valve - 103/104
A 340 will use a 104.8796 with a 2.02 valve - 104
A 360 will use a 101.6965 with a 1.88 valve - 101/102
A 408 will use a 100.7280 with a 2.055 valve - 100
