hi my piston has numbers on the topp it says
0940j
and in the middel is 795...6600
the two digits after 5 i cant make out its been beat on prtty good not sure if it is a wisco or some other kind can u help me
thanks

 

i was lookin in my dennis kirk book and it says it's a wiseco racers choice long rod kit must use plus 5mm long rod or long-rod crank, the numbers that you can't read should be MO,,, says it's a 370 cc bore size is 66.mm,, over size mm 2.00, which if i'm correct but not sure is bored 100 over, i hope your cylinders look good!!! this is what i've gathered but i could be wrong, hope i helped!

 

i did some research also and i came up with same as you did hugs.
my jug is good littil honig it be fine
this piston didnt brake it just looks like it wore away around the edges and middle alomst looks melted i dunno
but thanks for the help

 

by the way i came up with 397cc replacement not sure now lol