He clearly states in his follow up reply that he is curious if the flow increase from porting would be worth x amount of money.
So put this perspective Brian, say 400 dollars later his x heads flow 250 cfm, say about a 30 something cfm increase and all within the .550 lift and under in the 'longevity street life' range. Now do you believe 30cfm/60 hp potential increase for 400 bucks isn't the best bang for your buck compared to spending 1500+ dollars for an extra15-20cfm the rhs have in the version you sell?
$400 vs 1500$
That's almost 4 times the money for an extra 15-20 cfm peak and a few more throughout the range , a closed chamber , and and an extra 12 lbs a piece.
Still the question is basically which upgrade will give best bang for buck.
Maybe the op can state a budget or future plans, otherwise aftermarket heads are incorrect for his app and he is already equipt to do what he wants to do.
