M90 bottom end has the same specs as the M88 and S38B35 (93.4mm Bore x 84mm Stroke) and were last produced in 1980-1981ish. US & Euro M30B34 and B35s had 92mm Bore x 86mm Stroke.
Late production E12-based E24 635csi and early production E23 735i used the M90 in conjunction with an early Motronic 1.0 basic system (002 DME I believe).
Late production E12-based E24 635csi and early production E23 735i used the M90 in conjunction with an early Motronic 1.0 basic system (002 DME I believe).
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