Hi John and George, Is the vacuum and centrifugal advance in the distributor operating properly and advancing the spark enough for high speed driving? A retarded spark causes the engine to run considerably less efficiently ( Don't these damn smog laws drive you up a wall!! I'd like to catch the idiot who came up with those things!!! ) and that will cause the engine to run hotter than normal. Kurt ( Mechanical Engineer! ;o) Kurt Greske ( kurt_greske@xxxx )