Re: 3.0 mercruiser to 5.7L conversion
5.7's got the same drive but its likely geared different in the lower unit I think, and whatever the boat equivalent of a bellhousing and flywheel is those are likely different too. Dunno about the spline count on the input shaft and coupler either. i think the wiring and linkages may be compatible though, just make sure you get a totally complete drop in mercury marine 5.7 not a car one.<br /><br />Almost better to find a complete engine and outdrive from a junk boat and use that than just the engine. I think the hole in the hull and physical mounting is the same for all alpha 1's though.<br /><br />Also don't forget your going from one exhaust manifold to two thatll take some fiddling to get the exhaust worked out.<br /><br />Plus itll sit a tid bit *** heavy in the water, a 5.7 weights a bit more than a 3.0<br /><br />too bad its not a 4.3, those are just 5.7's with the front 2 cylinders missing so cept for the flywheel and the gearing its all identical for the most part.<br /><br />hmm I kinda rambled a bit there
