any suggestions
 

Well I finally got around to taking the piston out of my 100, only to see the top ring in 3 pieces. So I took it the machine shop only to find that it is a 10hp block with a 12hp piston in it and that the cylinder is egg shaped. It will take approximately another .020" bored out to get it back into shape. My question is should i just have it completely rebuilt and just be done with it or what? All suggestions are welcomed.

I would other wise you may being on a big headache later

You have plenty of room to still overbore it. K301 blocks have +.030 pistons and it is the same block. Have no fear.

ok good i just didn't no if it would be worth it but if it has lasted 40 years already hopefully i can get another 40 years out of it:buttrock: any thing i should have the machinest or me what to check or look at while im there or any reccomendations on doing a complete overall

Mine was a K301 block - I bored it to almost a 14hp. I think the bore is 3.410. It is Awesome! The vibration is bad, but its so strong....

Definitely, while that block is stripped - polish the intake and exhaust ports. It doesnt have to be super smooth, but to get the casting lines and ' pits ' out of the ports makes a noticable difference.

William - I was just reading some controversy over polishing the intake port. One argument is that you get better fuel atomization with the rougher intake, as it supposedly creates more turbulence. There was no argument on the exhaust ports, smooth is good there.

I dunno, sounds like a plausible argument...

You could also sleeve it if you wanted it as a K241. Just throwing it out there for kicks.:beerchug: