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post #1 of 3 (permalink) Old Apr 22nd, 05, 02:45 PM Thread Starter
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? about pistons

I was given a set of GM pistons today.On the top #464664 on the bottom TRW and #508-99.They are flat tops with a single trough valve pocket.Are they forged and what is the application?

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post #2 of 3 (permalink) Old Apr 22nd, 05, 05:31 PM
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Re: ? about pistons

Not much to go on there, with GM numbers, but it sounds like an L-82 piston, like they used in the Vette's and Camaro's (which were forged up originally at the TRW foundry for GM). If that's the right one, the TRW #L2417F should be a similar piston. Thanks, Gary

Last edited by GOSFAST; Apr 22nd, 05 at 05:33 PM. Reason: Add Info
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post #3 of 3 (permalink) Old Apr 22nd, 05, 06:22 PM
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Re: ? about pistons

'71-'80 L-82 piston. Gm part#474190. 9:1 comp with 76cc head. Standard bore with pressed pin. Forged

69 RS 355 Tremec 5-Speed 4.11's

Last edited by 12run; Apr 23rd, 05 at 07:03 PM.
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