garethp6
Active Member
Hey all does polish and ported gain and more performance as my old engine had post to have them done but not 100% sure on that. I am woundering to have them done for this engine as my old engine was the 9.5 block and it did seem quiker then the 10.5 block i got now. How can i check if the old head had it done cause if that the case i will end up putting those head in this engine but b4 i can do that i will get all the valves ready for the unleaded petrol save my self some work any ideas any 1