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March is very aware of the FE problems with the underdrive pulleys, I talked with the engineering team and I removed the crank pulley from March and had a 7.25 made to match the original 428 pulley . After chasing the over heating problem " new larger radiator, bigger fan ect. the pulley made the big differance . I also looked at the original temperture of the 428 1966 engine thermostat . I now run a 165 not a 198 . I do not believe the old blocks should run the hot thermostat . Thats my 2 cents