This all started of cause buddy said x heads are for 7000+ rpm 318/340/360 and I disagreed with that, and you took issue that I said 318 heads where only designed with around a 273.
I never said 318 head can't be ported or can't be ported to 200-240 cfm and make decent power, What I've said most people won't port heads which leave running some kind of 340/360/magnum head the main option for making over 300 ish hp.
I don't doubt but if porting is on the table why port 318 heads to 200-240 cfm when you can port 340/360 heads to 230-270+ cfm or aftermarkets to higher 300+ cfm ?