Help me on engine code
The 454 in my k30 has the prefix CFS followed by the vin that matches the truck. I can't find CFS anywhere on the internet. Can someone help? The reason I ask is because I have the truck for sale locally and a buyer thinks the truck was originally an automatic instead of the 4 speed that's in it now. I'm not sure and I need to know what I'm selling. Thanks!
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Re: Help me on engine code
Post a pic of the pad.
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Re: Help me on engine code
What year truck? Also do you mean vehicle VIN or engine VIN?
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Re: Help me on engine code
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Here's a picture of the pad and the vin plate on the dash. I know it's the original engine to the truck, but I'm wanting to know if it was originally an automatic or manual. The suffix CFS would tell that info, but I can't find that code anywhere?
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Re: Help me on engine code
Do you have a quadrajet carb?
The carb number and drivers side linkage can indicate trans type. That CFS isn’t a suffix code. Where is that pad located? |
Re: Help me on engine code
Yes Q jet on a performer intake, but the carb is from a 1980 454, not original to the truck. The pad is a machined part of the block, where the pass side head and block meet, right behind the alternator. The stamped VIN on the pad looks a little hokey to me, I'm guessing the CFS code may be a warranty block? I owned BBC chevelle with a warranty block and it was stamped CE. Is there a VIN on a manual truck transmission? If so where would I look?
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Re: Help me on engine code
Looking closer I see it’s the right pad. A suffix would be further left on the pad.
I too had a bbc with the CE code. It was a warranty LS6 block. Original had 3 bad pistons. What trans? |
Re: Help me on engine code
the truck has the sm465, the CE chevelle had a muncie
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Re: Help me on engine code
Oh well, if it was converted to a manual someone did a very nice job! I'll poke around on the truck this weekend and see if I can come up with anything. Thanks all for the help.
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Re: Help me on engine code
There might be a pad on the trans somewhere with a partial vin.
I know m21 and m22’s had one. Exactly where I can’t remember. What makes this buyer think it was an automatic? There’s a lot of stuff needed to change trans. Steering column, wiring, brackets etc. |
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The engine code letters will be a suffix (the last digits) not a prefix (the first digits). The SM465 transmission ID is stamped on the rear face of the transmission case, below the rear retainer. |
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Re: Help me on engine code
Maybe I'm dumb and missed something obvious, but why are we looking at the motor to figure out whether it was a manual or automatic instead of RPO codes in the glovebox?
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Re: Help me on engine code
Is it hydraulic clutch or mechanical? If its mechanical the z-bar bracket on the frame under the driver's side floorboard should be rivited to the frame. Post some pictures of the truck and setup- that will help immensely with determining if it was swapped or not.
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I can see if the question was if the transmission is the one that the truck left the assembly line with, but that's not the way I read it. The buyer just wants to know if it was originally an SM465 or TH400, and there's an easy way to do that. The buyer sounds like a clown anyway. I'm not sure if I'd even go to that much effort to answer him. |
Re: Help me on engine code
Spid in glovebox isn’t always the one that came with the truck. You can buy repro ones. And glove box doors can easily be swapped.
Suffix codes and vin stamps on the motor are much more accurate. Harder to fake. And not normally re-stamped. I don’t think the op is concerned with the buyer bs, he just wants to know for himself. Are you enjoying the snow SKR? |
Re: Help me on engine code
Every engine code that starts with CF, that I can find, are small block codes. No CFS as you mentioned. Can you get the block casting numbers off the side of the engine, which could help narrow it down some.
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Re: Help me on engine code
Email the VIN to GM customer service.
They'll send you a PDF in a couple days with a detailed list of factory installed options. ---------------form email--------------- Email to: socialmedia@gm.com Subject: Build sheet request Hello, I read that I could request a build sheet on the 67-72 Chevy Truck Forums. I'm hoping you can provide me with a build sheet for My GM Light Truck. 1985, Chevrolet, K30, VIN: 1GCHK34W3FS117369 Thank you, --------------------------------------------------- |
Re: Help me on engine code
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Thanks for the link, I'll try the GM email thing or you can if you want? Had a few minutes tonight and took these pictures. I'm sure I didn't find the right place on the trans for the VIN, but here's the characters I saw. The spid and my buyer are both gone, just wanna know for sure what I'm selling so I can answer the next buyer's questions.
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Re: Help me on engine code
Decode is from the 1985-1987 GM Light Truck parts books.
Truck VIN:1GCHK34W3FS117369 1= USA build G= GM C=Chevrolet H=9,001-10,000lb brakes & suspension K=Reg cab 4WD 3=30 series (1-ton) 4=2 door cab W=LE8 7.4L 4bbl V8 3=checksum digit F=1985 S=St Louis 117369 is the production sequence number Engine VIN:CFS117369 C= Chevrolet FS117369 Matches last 8 of vehicle VIN. The three letter 1985 7.4L engine suffix codes will not tell you any more than the VIN. I looked up the ones listed in the parts books. All you can find out is they were the LE8 RPO in a 3/4 or 1-ton chassis trucks... VIN W... The alphanumeric prefix to the three letter engine code would be the build date... again not terribly informative. Transmission ID code:N5P24 N=4 Speed Muncie CH465 5=1985 P=September 24=24th day of month Some observations. Take them for what they're worth. It looks like the numbers match your truck with some oddities.
The 1985-1991 hydraulic clutch setup isn't the easiest thing in the world to retrofit. Look on the LH frame rail next to the bellhousing. If this was originally an automatic truck it'll probably still have the sheet metal retainer for the shift linkage pivot ball riveted on the frame. Not sure any of this matters that much on a 1985 K30. I'm also not sure why someone would go to the trouble of re-stamping the engine pad in a 1 ton truck unless it was possibly done as a dealership re-power at some time or it was a hot engine or a machine shop that decked the block actually re-stamped it...? Get the build sheet. I'm interested in what the story might be. |
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C = Chevrolet F= 1985 Model year S = St Louis assembly plant 117369 = sequential portion of VIN Hatzie is absolutely correct. K |
Re: Help me on engine code
I just saw your comment about the manual transmission tilt column...
Tilt or not the column is an 85-91 part. Tilt with a manual transmission means it was special ordered. That's a rare piece. I doubt someone went to the trouble of finding a manual tilt column on an auto to manual swap of a K30. |
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Both are Indian Bronze Metallic. Both 350 4 speeds. Both have a tilt column. I looked at both at different times before I bought an 84 short 2wd in the same color. 305 and turbo 350. Maybe it’s a regional thing. Both sold originally in Victoria. |
Re: Help me on engine code
You may be right on the regional thing.
Usually the SM465 were Custom Deluxe 8' bed work trucks in this area with no extra expenses like tilt steering. My 85 custom deluxe had a V8 engine and heavier foam in the bench seat. Everything else was base options. I added delay wipers after I bought it. |
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Here's an old picture of the interior, the tilt is there, but kinda hard to see. I've traced the truck back to the dealership that sold it new. The guy I bought it from got it from the original owner, then the truck was stolen out of his driveway and recovered a short time later. The thieves brush painted it brown and hid it in the woods, but the patrol helicopter had no trouble spotting it. After getting his truck back, the second owner was bummed about the paint damage and sold it to me. I agree the VIN stamp on the engine was probably done at a machine shop or dealership. I'll send for the build sheet and post the results. It's not pretty, but I like the old truck and am having seller's remorse even before I have it sold. I may take it down to the farm and put it in long term storage?
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Re: Help me on engine code
If you happen to be passing by a GM dealer, take your VIN to them. I had mine print off a sheet with all the RPO codes and descriptions for most of them. No need to wait for something to be mailed/emailed.
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Re: Help me on engine code
Looks like a fairly well optioned Silverado trim level truck with a manual trans that somebody stuck an old vinyl seat in.
K |
Re: Help me on engine code
It's a well optioned factory black/silver K30 454 silverado. I put the old style seat in because they are firmer and sit better than the 81? on up. I sent an e mail for the build sheet, but will also try the local GM dealer.
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Re: Help me on engine code
socialmedia@gm.com
7:38 AM (11 minutes ago) to me Thanks for reaching out to us, Dave. However, due to the age of your vehicle, we are unable to pull specifics on your vehicle. However, you may reach out to www.gmheritagecenter.com, as they may be able to assist. We hope this helps. Have a great weekend. No luck on the build sheet yet. [THREAD ID:9-2JYOLMK] |
Re: Help me on engine code
Betcha the GM dealer can get one for you.
GM Heritage can if you strike out at the dealer. |
Re: Help me on engine code
The vin wouldn't come up at the local chevy dealer, he even tried to find a previous service report, nothing there either. I've looked it over, no evidence of it ever having an automatic trans, I'm convinced it's always been a 4 speed. Thanks!
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