GM Piston Identification - Third Generation F-Body Message Boards

Tech / General Engine Is your car making a strange sound or won't start? Thinking of adding power with a new combination? Need other technical information or engine specific advice? Don't see another board for your problem? Post it here!

GM Piston Identification

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

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.
C-McN is offline   Reply With Quote
Old 12-18-2009, 01:49 AM   #2
Supreme Member
iTrader: (13)
Join Date: Apr 2005
Location: Not in Kansas anymore
Posts: 7,709
Car: 90 Vette
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: 9" 3.73

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

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 02:26 AM.
vetteoz is offline   Reply With Quote
Old 12-18-2009, 06:29 AM   #3
Junior Member
Thread Starter
Join Date: Feb 2008
Posts: 4
Car: 1989 Firebird Formula 350
Engine: 5.7L V8 TPI
Transmission: 700R4
Axle/Gears: 9-Bolt, 3.27

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.
C-McN is offline   Reply With Quote
Old 12-18-2009, 06:36 AM   #4
Supreme Member
iTrader: (25)
Twin_Turbo's Avatar
Join Date: Jun 2000
Location: Enschede, Netherlands
Posts: 5,171
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

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.
Twin_Turbo is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
blowby issue? NZKnight Tech / General Engine 6 10-15-2015 03:47 PM
[TX] Dyno Don's, UMI K Member/A Arms, Koni, Wiseco, Scat LT1Formula Engine/Drivetrain/Suspension Parts for Sale 7 10-08-2015 09:34 PM
[ON] 353 GEN 1 SBC: What's It Worth Where You Are? skinny z Engine/Drivetrain/Suspension Parts for Sale 5 10-05-2015 07:23 PM
HP increase with flat top & RV cam hartsmike Engine Swap 11 10-02-2015 08:11 AM
SLP line Lock & Trans Servos Dragonsys Engine/Drivetrain/Suspension Parts for Sale 2 09-25-2015 04:51 PM

Go Back   Third Generation F-Body Message Boards >

14096478, 464664, chevy, gm, id, identification, identify, list, number, numbers, part, piston, pistons, stamped, trw

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Featured Sponsors
Vendor Directory

1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92

All times are GMT -5. The time now is 04:12 AM.

All content copyright 1997 - 2014 All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of's Administrators. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.
  • Ask a Question
    Get answers from community experts
Question Title:
Your question will be posted in: