The Supercar Registry - GM Piston ID

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- - GM Piston ID (https://www.yenko.net/forum/showthread.php?t=154805)

Caseys69

04-30-2019 02:25 AM

GM Piston ID

1 Attachment(s)

A friend has a set of original pistons and we cannot seem to find anything on them. The number stamped on the top of the piston is 3875909

dvss1

04-30-2019 03:04 AM

Are you sure thats the number? Could it be 3875905? 3875905 is first design hi perf 396 oversized piston. I looked at a set at the Jefferson swap meet over the weekend.

Caseys69

04-30-2019 03:09 AM

I just posted a pic, its definitely a 9

dvss1

04-30-2019 03:17 AM

Yes definitely a 9. I would measure the piston and see what the OD is. Looks like a 396 piston.

dvss1

04-30-2019 03:20 AM

Are there any Numbers on the inside of the piston?

Caseys69

04-30-2019 10:43 AM

Its just stamped TRW on the inside

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