I was talking /6 years ago with a machinist who is now in that big machine shop in the sky. He had one of the aluminum blocks and his comment was that they are not real good when you start "leaning" on them. Apparently the sleeves sort of free stand in the block,if that makes any sense.They are not enclosed by the block at the top,I'm sure someone on this fine list will know for sure? If this is true,the long stroke of the 225 in relation to the bore size would cause some stability problems at high rpm, to my way of thinking.My way of thinking is often wrong however. Stan in Montana __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com