Re: Mercury lower unit ??
35 and 40 twin, 40, 45 and 50 inline-4. 60s, 70s, 80s, 90s. Mercury and Mercury-made Mariners. They made those for a Long time! The 50/60/650/70 triple motor gearcases look alike, but the mounts are different. There may be different gear ratios, but I wouldn't think they'd vary by much. You can compensate with prop pitch if necessary.
