Sorry didn't read to the end of your reply. An overheat engine merely take the stress out of the metal. Most drag racers I know want used motors has a starting point. When I was freshly out of college I had a 1962 Chrysler 300H. Little background; Chrysler took their lightest body off the production line (A Newport) Married a custom built BIG motor (A 300A had a 396/39? hemi with raised compression, special intake manifold--those motors were used for year as the starting point for the drag cars) by 1962 it was a 413ci motor with custom intake manifold the valves were huge and the small motor made just over 400 hp and it really would peg the speedo at 140 mph don't ask how I know. The valve were so large that the metal between the intake and the exhaust was very thin and would crack with just slight overheating. I got very good at changing heads; would figure out which had broken go to a wrecking yard for another head, get it rebuilt then replace the broken one with the newly rebuild one in about 2 hours. I remember one trip I took to Deception Pass--it got to smoking on the way and on the way home some guy thought he would race so I just ran off and disappeared. The rings broke on one piston. The whole point is that overheating isn't all that bad, It's cracks that are not so good. High Mileage motor? I had a turbo'ed 4 cylinder motor that broke the rings on 2 cylinders after 100,000 mi. I think the rings broke because of too much pressure from the turbo. I rebuilt the motor doing all the things I've talked about; Bronze valve guides, high quality bearings and rings. I also bored the cylinders and put in sleeves and new pistons. The motor is still running with no lose of power and no burning of oil. It has like 350,000 mi. on it today. Your not putting lipstick on a pig your building a keeper and depending what else you do maybe a racehorse.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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