Gotta GPR with pipes, porting, carbs, msd, 165lbs compress. I am trying to find out what would be the best pitch prop for a stock pump for this setup. I was thinking a 14/21 or 14/22 or maybe a 15/21. I ran 7800 rpm with a 14 vein magnum and a 16/ 20.

Thanks

I use a 17/24 swirl in the race gas flat top motor'd (185psi) ss gpr I have (14 vane magnum). Turns the prop about 7600 in closed course race set up.

Go ahead and put a big prop in a triple and lag
the motor you will sieze it up some time bigger
is not better keep the rpm's up there and it will
live.