Re: ’60s lark / seahorse swap

[Casey Lynn]

Gotta’ go with Frank on this one. The crank issue is a bit blown out of proportion these days. There are still a bunch of those engines out there that never broke a crank and ran reliably. Also, you may have an engine that did break one and had the powerhead replaced already. Regardless, if that is what you have…..run it!
What I do seem to remember here is that the physical size of the crank changed somewhere around 1962? When that changed the driveshaft changed as well. Do some homework on part numbers and you should come up with the answer to that one.
Believe part of this question already was answered on another forum.