Quote:

isn't the single plane only good til 500hp?

also just realized no one mentioned brodix heads



From personal experience:

M1 single plane
850 cfm Mighty Demon
451 cubic inch stroker, 9.5:1 compression
452 ported factory IRON heads 295 cfm @ .700"
Comp solid street roller 256/260 @ .050", .600" lift
621 HP @ 6100 rpm and 588 TQ @ 4600 rpm


Brodix heads, ah, way expensive for the same or less flow out of the box as the RPM head.