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Averagef250 - I see you have an M5R2 behind a 4BT. How many miles have you put on it behind the 4B and any problems? I am in the process of building a 1990 F150 with a 4BT and in the interest of keeping the project moving I'm going to stick my M5R2 behind it and then rebuild a small block S5-42 I have at my leisure and then swap it in. The M5R2 has about 185,000 miles with no rebuild. The truck will be a pavement queen pretty much, no heavy off road. What is your experience with the M5? Sorry for the thread hijack.
 
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