helimech

I have a 2000 LS with bent valves from broken timing belt. Question is can i put a p8r head on and what would my benefits/downfalls be. I have a P8R head in perfect shape and would like to use it if i would not loose performance. Motor is currently stock in all areas. unless cold air counts! I know the P8R head has 84mm chamber and 33mm intake valves.