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Replacing 85' 240 '511 ECM/ECU with a '554 200

Good question and your info is pretty much correct at least the reputed 554 upgrade. However, I will say that when I put a 554 in my 86 245 (M46) it did not drive well at all and I stuck the 544 back in pronto. Anyone selling you an ECU should agree to take it back if you are not happy. Then too, so few 511/544/554s fail that the market for used ones is very week and you should not pay more than $50 for one. The salvage yards are full of perfectly good ones.






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