cylinder bolts

Hi there! first post i think. (to skip the story and go straight for the question, scroll down to the bottom) Been reading here for a while, learned A LOT in the last two years. Had absolutely no clue about fixing chainsaws or anything 2-stroke before, but now i can do some maintence and...

Bought a Hyway 49mm short block for my 029 Super from SawAgain since my original bearings were shot and had a little scoring on piston. I've tried the original cylinder bolts and the set that came with the new cylinder and they all thread in but won't tighten. Anyone ever heard of this...