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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"

just bought my holley 850 and my heads are STAGE 1 MUSCLE MOTORS "STREET KILLER" 250 cfm @ .500 LIFT ,CAST HEAD

10:1 COPRESSION
COMP CAM 21-224-4
M1 SINGLE PLANE
ROSS FLAT TOPS
CAT RODS