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Indy 572-13 410+ cfm IIRC, CNC ported.
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....
My hand ported -13's flow about the same, around 380cfm. Got them untouched from Indy back in 2001.
I think Best Machine have a cnc program for these heads that would take them to over 410 cfm with a 2.35 valve IIRC. It was these I was thinking of.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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