Engine Suffix Decal - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**IronCanine** · 03-03-2025, 09:13 AM

Quote:

Originally Posted by z10kl

Do you have a list like this for 71?

Sure. I can get a pic when I get home from work tonight. In the meantime, here is a comprehensive list of all GM suffixes:

https://nastyz28.com/chevy-engine-co...ngs.php#suffix

**1970cstblazer** · 03-03-2025, 09:24 AM

https://nastyz28.com/chevy-engine-co...ngs.php#suffix

https://nastyz28.com/gm-chevy-codes/...s-suffix-6.php

1971 truck engine suffix codes begin with a "T"

Example:

1971 350 code TBD:

1971 350 conv. & fwd cabs - 255hp 4v K-10 to 2500

z10kl · 03-03-2025, 10:43 AM

Quote:

Originally Posted by IronCanine

I don't know the extent of this style of decal. But I'm sure GM has this or similar beyond these years. Remember, the GM engine plants were servicing all assembly plants and vehicle models. These decals are not truck specific, but the suffixes would be. This is just a label for plant workers to quickly be able to ID the engine. But Chevelles, Novas, Vettes, Camaros, Impalas...you name it, would have had these decals. Evolving over time to what I'm sure is a bar code today.

I don't think so. Just for reference, here is a suffix list out of a GMC parts book showing the suffix for a 1972 4WD 350 auto with emissions as TFJ and an emissions decal from same with an LM.

Do you have a list like this for 71?

**'68OrangeSunshine** · 03-03-2025, 03:17 PM

Unfortunately the NastyZ28 website only covers V8s. There is no database for L6 motors.

**IronCanine** · 03-04-2025, 09:55 AM

Quote:

Originally Posted by z10kl

Do you have a list like this for 71?

Here you go.

**'68OrangeSunshine** · 03-04-2025, 04:08 PM

The three letter code stamped onto the OEM L25 that was in my '68 C/10 Stepside when I bought it is XAE. According to charts I've seen, a '68 292 L6 should have 2-Letter code beginning with U.
I'm guessing XAE was a warranty replacement block, back when it was under the PO's warranty.

54blackhornet · 03-04-2025, 07:53 PM

Very informative post ! Is it possible to find the air cleaner decal for a 1971 307 and the emission sticker ! Manual transmission…

z10kl · 03-06-2025, 08:12 AM

Quote:

Originally Posted by IronCanine

Here you go.

Thanks, now if I only had a TBG engine

**IronCanine** · 03-06-2025, 08:47 AM

Quote:

Originally Posted by 54blackhornet

Very informative post ! Is it possible to find the air cleaner decal for a 1971 307 and the emission sticker ! Manual transmission…

You'd just have to find original examples to copy. A good graphic artist could do it. I'm not well versed in the air cleaner decals. I've always just put the available 'KD' on our 350s...which candidly is not a great reproduction. We reproduced the CA emissions decal for Pete's Blazer a few years ago that turned out great.

Quote:

Originally Posted by z10kl

Thanks, now if I only had a TBG engine

You can find one. FB Marketplace! Just remember, you're looking for K5s, K10s, K20s (Blazers, Trucks and Burbs!).

03-03-2025, 09:24 AM	#27
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 2,501	Re: Engine Suffix Decal https://nastyz28.com/chevy-engine-co...ngs.php#suffix https://nastyz28.com/gm-chevy-codes/...s-suffix-6.php 1971 truck engine suffix codes begin with a "T" Example: 1971 350 code TBD: 1971 350 conv. & fwd cabs - 255hp 4v K-10 to 2500 __________________ 1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels

03-03-2025, 03:17 PM	#29
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 8,118	Re: Engine Suffix Decal Unfortunately the NastyZ28 website only covers V8s. There is no database for L6 motors. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

03-04-2025, 04:08 PM	#31
'68OrangeSunshine Senior Member Join Date: Feb 2002 Location: Tucson, AZ USA Posts: 8,118	Re: Engine Suffix Decal The three letter code stamped onto the OEM L25 that was in my '68 C/10 Stepside when I bought it is XAE. According to charts I've seen, a '68 292 L6 should have 2-Letter code beginning with U. I'm guessing XAE was a warranty replacement block, back when it was under the PO's warranty. __________________ Every 25 years I like to rebuild that 292, whether it needs it or not.

03-04-2025, 07:53 PM	#32
54blackhornet Registered User Join Date: Jul 2008 Location: Eastern Oregon Posts: 2,481	Re: Engine Suffix Decal Very informative post ! Is it possible to find the air cleaner decal for a 1971 307 and the emission sticker ! Manual transmission… Attached Images __________________ 71 C-20 07 Magnum RT AWD



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