Motor swap help

[Tommydoe]

Hey just got my first v20 78 has cracked block picked up 350 getting ready pull 305 this thanksgiving weekend any tips to look for or be aware of any advice would be great

[jvitiel]

Welcome Tommy !

Looks like its new members day around here!... :clap:

[Tommydoe]

Thanks i know somebody out there as already done this before , iam excited been looking at gallery pic getting some great ideas

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[spareparts]

Mercruiser I assume? where are you getting the replacement engine from? Make sure to put new manifolds and risers on when you swap it out. Don't cheap out and use car stuff

[Tommydoe]

Yes found 2 350 mercruiser complete & outdrives props & all rebuilt guy had bad luck with rotten boat & cut his losses so i have extra parts

[fixit]

i had to redrill my motor mounts as they were in a different location (4.3-5.7L swap) need a long drill bit...

everything else was relatively easy

[spareparts]

what year model are the engines you acquired?

[Destroyer]

Welcome aboard Tommy.

[Tommydoe]

90 i believe not vortex

[spareparts]

Alpha one drives? You'll need to swap everything...motor, transom plate and drive. Yes, you can swap some of the components to make it work, but youre better off swapping it all. Take the time to rebuild the transom plate while you have it on a bench. Bellows, water tube, shift cable etc..

[Tommydoe]

I have alpha 1 out drive now i kind now i need to replace boots & gaskets but you dont think the 350 mounts like the 305 i have in boat now ?

[spareparts]

front motor mounts should be in the same location, or close enough. Rear mounts differ between the older engine/transom plate and the newer engine/transom plate. The exhaust y pipe stays with the transom plate. Keep everything together as a package

[Tommydoe]

Thanks will take some pic i appreciate the advice