Re: 54Evinrude Big Twin crankcase

[jeff-register]

I’m just reading the post. I see filthy gasket surfaces & if I’m correct you haven’t honed the bores or used a taper mike to look for run out in the bore. How about the pistons? scoring, ring land wear, wrist pin clearances / bearing wear & ring wear. My first build was a 48 Dodge flathead 6. The new rings were so tight it would lock up after it was warmed up. It sure didn’t burn oil but we drug it backwards in reverse to get it loose. Your motor seems to be in rebuildable shape but you need to check clearances & clean gasket surfaces. What kind of threads are you going to use on the plug hole. I have a Evinrude 1954 15hp too. Great motors & easy to build.
Have fun!!