i changed the hg. i lapped the block and had the head shaved. it has about 1k miles on it if that since i did the hg. the felpro is basicly a stock hg. the stock style hg do ok until u start overheating often. which even a metal head gasket would not matter due to head warpage. i have read several threads (supraforums) with problems sealing a metal head gasket. both surfaces need to be exact. so i chose to get a stock hg. if it lasted 150k miles before i dont have a problem with it.