I think you are more likely to damage the heads than make them better. My pump gas 470 engine made 720 hp with out of the box 240 heads. If you want more than 720 hp then buy the 270 heads.
Thanks andy..
I've followed your build closely, thank you for all you did on the 470, I am running a few steps smaller then yours & haven't the budget for the oiling system. I was just checking to see if there were some elbow grease areas I could get some gains rather than opening up my wallet much further. Thanks you again for your input andy
