Re: new engine
fishbone, find out what max rpm for your new motor is as recommended by Jasper...that's what you're shootin' for when "proppin" your motor...
...a 4'' crack in your lower-unit could be VERY signifigant...do what you gotta(repair or replace) on that issue and while you're at it, you probably wanna put new water-pump in it...
You may also need a thermostat that allows more water flow, too...
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'74 V-20/ BF 150
'95 V-21/ BF 150
'84 V-20/ 200 2.4 Merc
'87 V-20/'18 F150 Yamaha
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