Fred,
Solid Lifters? Oversized Valve Springs?
570-590 is right if you don't float. Otherwise I'd say 550 at 6300-6400.
But then again, KC is the king of getting more HP than anyone else with the exact same combo... Great head work, magic dust, whatever...
Eric Brown (GreatAsp) had a 418 from Perf. Engineering in Ross making 550+ HP. Eric told him 650HP was possible with bigger valve springs at 7K RPM. Same basic setup as yours, AFR 205's, etc...
My 408 made 508 HP but with an RPM Air Gap intake (more torque) and 185cc AFR heads (again, more torque, less HP). 544 lb-ft. Engine dyno guy said additional 40-50 HP possible if he had a day with my heads (knock down the CNC grooves for a smooth polish). After this season, going to pull it out and do some massaging for fun.
Enjoy your stroker!!
