If it works it works. I posted mine here, but if anyone wanted to see them they can go to my u-tube channel and watch them. I did the low dollar 318 heads on this site and over 4 years later they are still taking a pounding and most importantly - I'm happy with them! Cost? new exhaust valves, valve seals and new eddy springs and throw in a few stones for porting and maybe 125 bucks total.