In a message dated 5/14/2003 7:15:09 PM Eastern Standard Time, moparmike@xxxx writes: > Engines run with manifold heat warm up better, have better driveabilty, and > > get better gas mileage. The "hot spot" in the manifold is sized so that it > is cooled off by the extra fuel/air flow during high speed running, and > doesn't affect top end power to any easily measured degree. You can do > without it if you don't mind extra raw gas washing down the cylinder walls, > shorter spark plug life and crappy inefficient running around town. > Mike > If the heat tubes were to be blocked where they meet the intake manifold, would there be enough heat at the intake to make a difference? George Clineman [Non-text portions of this message have been removed]