SBM head velocities and there application?

340/360 2.02/1.88

1st, not sure if the port length is 4.95" ? for these heads but using it for now, as long it's not to far off should be close.

From what I understand 340/360 heads are in the 150-160 cc range and flow 200-225 ? (1.88 vs 2.02)

Average csa = 1.85"-1.97"

Velocity 200 cfm = 244-260 fps, 225 cfm = 274-292 fps they seems like there around the so called ideal velocity range 250-285 fps.

Engines cfm demand

273, 200 cfm = 6000 rpms, 225 cfm = 6750 rpms
318, 200 cfm = 5150 rpms, 225 cfm = 5750 rpms
340, 200 cfm = 4800 rpms, 225 cfm = 5400 rpms.
360, 200 cfm = 4550 rpms, 225 cfm = 5100 rpms
408, 200 cfm = 4000 rpms, 225 cfm = 4500 rpms

Min csa 200 cfm = 1.5", 225 cfm = 1.69"

Close as I can with the info I have.