What would it take to make 1.44 lbs-ft per cid ?
Wonder what the Ideal ratio of exhaust port volume, flow and velocity is to achieving higher lbs-ft per cid, I feel it's one of the reasons LS heads do so well, even why I think magnum heads respond well to cams.
There is no real ideal anything. Especially building engines. There are plenty of rules of thumb ****. But that gets you close.
The general rule (NA) is get the biggest intake you can, fit the exhaust valve and then deal with it.
You can spend time, effort and an assload of money to try and develop a formula of those ratios, but it will only matter in that specific application.
This is what I know. It is settled unless arguing is what you do. Not YOU specifically. You in general. I think you can figure that out.
I know the exhaust port on most of the stuff we deal with is way too big. So is the valve. You’re kinda stuck because shrinking a valve for a Chrysler Pcar head is near impossible. It’s certainly impractical.
So you deal with it.
It’s hard to change cam timing to help the big port and valve, especially when the engine wants more exhaust duration but if you give it more you’ll kill a bunch in the middle of the torque curve for a minimal gain in hp.
The W2 has a port on the big size, but I think using a 50 degree seat I can shrink the valve down to 1.500 and have a better shape. Because shape is more important than flow.