One the Cobra the counter rotating is done in the lower unit, the uppers should be identical. In my OMC manual it states that they recommend that the counter rotating drive be installed on the port side, but I don't know if FW installed them this way. The small block V-8 and V-6 did use the same lower unit, and the 4.3, 5.0 and 5.7 all used the same gear ratios in the lower (14:26) but the ratio in the upper units is different for each engine.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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