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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.



Flow is not everything. There is a lot more to making big power than just flow. Chamber design is a big deal i think, and in that Edelbrock is most definitely a compromise design. One thing i dont like about the B1's was the weight... they're not much lighter than the iron... you save only 14lbs per set! Its great that they're such a stout, well-built head, and that they can be taken quite far, but weight-savings is important too.