When it comes to engine work, trust no one..... I have seen too many builds go sour because of it.
Get a Clymer and verify the specs..
Do I sound cynical?
you sound like the real life, where some guys dont know what they have to do for installing the right pistons...
i saw some strange things in blown engines... 1. place an old aircooled simson s70-engine.
the guy installed a new piston, cylinder and plug. as he cames to me with the blown engine, ha said there were always a knocking in the engine since his rebuild 4 days ago! but he couldnīt locate it and rode it and kaboom after 50 miles.
i pulled the cylinder and found a big hole in the piston. cause, the idiot had installed a wrong plug with to long thread that hits the piston all the time...
i cleaned the crankcase without splitting, installed new piston and right plug with the short thread that is needed on it and voila... than it was one of the best engines, as it run again..