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Old 12-17-2009, 06:07 PM   #1
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Join Date: Feb 2008
Posts: 4
Car: 1989 Firebird Formula 350
Engine: 5.7L V8 TPI
Transmission: 700R4
Axle/Gears: 9-Bolt, 3.27

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GM Piston Identification

Okay, let me lay this one on you fine people:

I have a set of piston all stamped with "14096478." I don't know anything about what they were pulled from, other than that it was a newer style, 1-piece rear main seal 350 4-bolt. They're flat tops, and I'm guessing forged.

That sure looks like a Chevy part number, but I called GM and they said it was invalid. Since one of these pistons is cracked, I'm looking for a replacement.

If anybody can help me identify what engine these things might have come from and what the most similar substitute would be, I'd be very grateful.
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Old 12-18-2009, 12:49 AM   #2
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Location: Not in Kansas anymore
Posts: 7,708
Car: 90 Vette / 67 Camaro / 87 Vette
Engine: 383 SP EFI /383 LT1 /L98 TPI
Transmission: T400 /200R4 /T700
Axle/Gears: 9" 3.90 /12 Bolt 4.11 /D44 3.07

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Re: GM Piston Identification

The # on the piston probably doesn't show up in the listings as GM sells pistons and pins as a assembly under a different part #
Do they look like this?
used in Vin K Chevy truck engines from 1991-1996

Click the image to open in full size.
If nothing is available from GM then you are going to have to cross reference to a replacement from Sealed Power or similar.May have to check dish size first

Last edited by vetteoz; 12-18-2009 at 01:26 AM.
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Old 12-18-2009, 05:29 AM   #3
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Join Date: Feb 2008
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Car: 1989 Firebird Formula 350
Engine: 5.7L V8 TPI
Transmission: 700R4
Axle/Gears: 9-Bolt, 3.27

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Re: GM Piston Identification

^^Bingo, those are it.

Thanks so much for the ID and the explanation! ThirdGen never fails to spread some knowledge around.
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Old 12-18-2009, 05:36 AM   #4
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Location: Enschede, Netherlands
Posts: 4,471
Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98
Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI
Transmission: T5, 700R4, T5, 700R4
Axle/Gears: 3.08, 3.27, 3.45, 3.27

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Re: GM Piston Identification

Those are most likely trw or sealed power numbers, the L82 464664 piston used by GM was a TRW part number, that might be a sealed power one right there. With 2 reliefs looking identical in size to the L82 piston I'd say they are at least a 14cc dish (2x7)

In the chevy power manual there are very similar part numbers listed like that in the pistons section but they're not the GM part number. The GM number is for a piston w/ pin and rod combo. The tables in the book however do list the TRW and other part numbers. Like 464664 for the L82 piston, there are numbers there that are the same as yours apart from the last 4 numbers. That makes me believe they are sealed power numbers.
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Old 12-18-2009, 05:36 AM
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