V8s always had the same OD, regardless of chrome bumper or rubber. They should be black on all chrome bumper 4-cylinder cars, and blue on 4-cylinder rubber bumper, the colour change representing the change in speedo drive gear ratio. Geoff Dunlop wrote to me from Australia asking if I could shed any light on a green label cover on his factory V8. The D type is not as strong as the LH and has vacuum switch and relay to prevent the driver from disengaging OD under certain conditions - high revs and no throttle - which could overstress the unit. The LH also has a higher OD 4th ratio that the engine is well capable of pulling, giving even more relaxed touring. Thus the LH type has closer to a '3rd and a half' ratio than the D type, but both offer a useful mid-way point between 3rd and 4th for spirited twisty bits or a long steepish climb. The earlier D type has an OD 3rd ratio that is closer to 4th than the LH type - 73% as opposed to 65%. There are both ratio and electrical differences between the early and later ODs fitted to the MGB. Info found from googling (no hard references as yet): Interesting bits copied here for discussion:
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