Old street/strip...6X's milled to 86cc, home ported (230 cfm?), on a stock stroke 462.
New strip/street...62's race ported (254 cfm at .600" on a 4.151" bore @ 28"), on a 468 (4.25" stroke by 4.186" bore). These heads have gone 10.50's @ 126-MPH on a 400 in a 3400 lb. car, so we'll see what happens with the tubby T/A.
308cfm is 308cfm, it doesn't know what head it's flowing through. Can't use the argument about velocity either, E-head port side by side with R.A. IV port is close, ported ot not.
