[LX5liter]

Hi Chris,
that does sound quite odd. I believe that your cylinders 5,6,7,8 are normal and you have a problem with the other bank of cylinders. (#4 as well? )Was the motor rebuilt in the last little while? I'm just asking because a similar thing happened to me a long time ago and it had turned out one bank of pistons (domed ) was installed backwards. It sounds as if you definitly have an interference problem somewhere.