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thanks guys.i am going from iron 346 flowing 280 at .600 and the BS are said to flow 330+ at that.these heads will give me plenty of room to grow and be repairable.any1 know what the cnc ported heads flow?

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Who ported your heads?

Dwayne ported mine and they go 325 @.600.

BTW, the out of the box numbers are junk on the BS heads. OOTB, the low and mid lift numbers are horrible.......to say the least.

I think Scott Brown used have flow figures on his website of some CNC'ed BS heads. I think they were close to 350 at .600.

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scott koffel is going to do the bowl,port match and said it would flow that.i think the cnc flows more than 350cfm no?
i w2ish the low flow was better.it would help me more i think.[446 cubes,.646 lift roller,6500/6800rpm]
this info some1 else posted.