The guy who ports our heads got around 410cfm, @ .850" IIRC on his bench. Hand ported, he said he wouldn't go any further as it would likely lower the numbers. It's a moot point really as we don't go any higher than .750 on the currently installed cam, at that lift IIRC it was 390. Again from memory, he was impressed with the mid flow numbers.
HTH's
'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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