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Identify this NOS, OEM, GM cat.

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Old Aug 16, 2019 | 11:50 PM
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chazman
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Identify this NOS, OEM, GM cat.
This came from someone's huge stash of GM factory parts. I believe it to be a 4 bolt flange L-69/1985 LB9, new and unused factory catalytic converter. Am I right?













Last edited by chazman; Aug 17, 2019 at 12:32 AM.
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Old Aug 17, 2019 | 01:25 AM
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Re: Identify this NOS, OEM, GM cat.
Does it have any GM part number on it? Such as 25056539?
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Old Aug 17, 2019 | 08:47 AM
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chazman
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From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: Identify this NOS, OEM, GM cat.
Originally Posted by JT
Does it have any GM part number on it? Such as 25056539?
The only number I could find on it was the one posted.

Anyone know if the L-69 Monte Carlo cat is the same as the L-69 Camaro/Firebird cat?
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Old Aug 17, 2019 | 09:16 AM
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Car: 1984 Chevrolet Camaro Z28
Engine: 5.0 Liter 4-BBL V8 High Output
Transmission: 5-Speed Manual
Axle/Gears: 3.73
Re: Identify this NOS, OEM, GM cat.
Originally Posted by chazman

Anyone know if the L-69 Monte Carlo cat is the same as the L-69 Camaro/Firebird cat?
Same
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Old Aug 17, 2019 | 06:07 PM
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Car: 1985 IROC-Z
Engine: LB9
Transmission: MD8
Re: Identify this NOS, OEM, GM cat.
Too bad this isnt for sale. A previous owner deleted my cat and cut the flanges. Exhaust shops around here dont want to (IE lazy) to make the oval opening at the end of the down pipe mate up to a round end of an aftermarket cat. Nice find!
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