Don"t know if you got them in the U.S, we did not get the 670, we got the 675 which had the 4.236 which from memory spat out a bit over 60hp on the dyno. We got the 675 (4.236) 690 (4.248) 698 (4.318 but not a good seller due to the problems with the 595 tractor which it replaced with the same engine) the 698T (T4.236) and 699 (6.354) Bolting on the turbo kit got the performance of a 698T which had the T4.236. We put the turbo kit on, then hooked up the tractor to the dyno and adjusted the injector pump to around 90hp at the PTO. (limiting factor was black smoke) It was a short cut cheap way of getting the 698T, but the engines started to give bother as I said before, you also did not get the differently geared transmission with the heavy epicyclic final drives etc, which also gave trouble in modified tractors. BTW I was working for a Massey main dealer in Eastern England at the time and these tractors were turboed on the first service so they were just bedded in, they were not old, with heaps of hours on the clock already.
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