If 12^3 cubic inches = 1728 cu. in. = 1 cu. ft., and 230 cfm = 1728*230 = 397,440 divided by one cylinder displacement on a 400 at 50 cubic inches = 7948.8 cylinder fills out of a stock head per minute.
Seems to me that the intake side of a #48 head is pretty healthy already! So why the improvement in dyno results unless you head up over 8000 rpm?
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching
