Quote: They are diamond part number 52030 but changed to 4.440 bore. (4.25 stroke, 7.100 rod and 1.480 compression height) pins are standard pins, I've always upgraded the pins but when talking to diamond they told for my application the standard would work just fine.
A reliable source told me that several years ago most shelf pistons came with a 0.155" wall pin, but now-a-days Diamond is using 0.185" wall pins and your 178 gram weight confirms what you have. The 0.990 x 2.93 pins with 0.155" wall were around 150-155 grams.
