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Indy 572-13 410+ cfm IIRC, CNC ported.

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tig, my 572-13,s only flowed [Email]388@.800".[/Email] i got them from indy with their cnc work done. they claimed 410 cfm to me too.

when i called indy and talked to ken, he said to flow 410 cfm, you needed to thin the valve margins and blend the seats. he also said that would reduce reliabilty. mine is in a street car.

their claim is just a marketing ploy, to buy their heads. someone told me theese heads would'nt flow 400 cfm with the valves out...i'm doing a 588-604 myself. i will be using b-1 mc heads on this one....

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