I heard all this talk about What impeller so i thought i would ask.
I have a 16ft semi v (with gas tank in the bow) with a 468. the motor is stock crank, stock rods 4 bolt main. the heads are stock with a 500 lift cam with a lobe center of 108. Dual plane intake with a 750 dual feed vac sec. over the tran water cooled headers. The pump i just got back from CP PERFORMANCE. they put in a AA impeller. after all that took the book out and only turned 4000-4100 at 58mph on gps. so should I change my impeller or what.