hi mates i recently get an set of used JE pistons the seller gave them to me in a box that says that the part number is 176450 well i did a little research and this box its from a 81.5 bore piston set but the piston inside says 81m so i dont know if they are 81 or 81.5 please tell me if the 81.5 pistons says 81m inside another thing is that the pistons itsel only says JE 81m anything else thank yalll please help me cuz if the are 81.5 i want my money back

 

their should a part number right on the piston it self match that with JE's website

 

Easy fix...it called a micrometer. Measure them.

 

Oook good idea im gonna use a micrometer but anyways i would like to know wich compression they are im gonna post some photo
s

 

^there is also alot of compression calculators online u can use to determine the compression of them if u can't id the pistons exactly.