I put one on my 440 back in 1991- a fresh built motor. It always ran 215 degrees: never overheated, but never ran at thermostatic temp either (180 degrees). A few years laster I swapped it out for a stock 7 blade replacement (cannot recall what prompted me to do so) - no other changes to the cooling system- and from that day forward the car ran at thermostatic temp.
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Ed EastCoast Land Yacht Assoc. 1967 Newport Conv: 440/4 speed 1969 GTX: 440/4 speed, TX9/TX9, A34, N96 1970 Super Bee: 383/4 speed, B5/B7 1970 Coronet RT: 440/4 speed, A34, N96 1970 Coronet RT: 440/auto, A36, N96 1970 Road Runner convertible: 383/4 speed TX9/D6XW 1970 GTX: 440+6/727, A32, N96 2001 Dodge 2500 HO CTD, 6 speed, 4x4 quad cab long bed "The early bird may get the worm, but the 2nd mouse gets the cheese".
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