small block engine decoding help... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**tkeduk8r** · 05-22-2006, 08:39 PM

have these two small blocks and finally got around to getting the numbers off the pad on front of pass cyl head....first goes like this

16K431089
VO401CMJ

2nd looks like this
1M1011
7VP

any ideas????
--Mike

Oldtruckfanatic · 05-22-2006, 09:07 PM

The numbers on those pads are suffix codes I can't remember the exact details but seems to me they were stamped at the factory with a plant code maybe a date code and the last few numbers of the vin. I may be wrong but it's something to that effect. the casting numbers identifying the engine are on the bellhousing flange at the back of the engine on the drivers side. that number will tell you what the engine is as far as model years and hp ratings etc.

jhow66 · 05-23-2006, 12:08 AM

CMJ---1974 350 with T400-- out of a police car-4 bar.carb
CMJ---1980 305 -auto-Camaro
(will need to check casting # on back of block on driver side to see which)
could not finf other one.

Oldtruckfanatic · 05-23-2006, 12:14 AM

Hey...I looked everywhere trying to find the suffix decoder but I could only find the casting decoder is that info online somewhere jhow66?

jhow66 · 05-23-2006, 11:23 AM

Try here:
http://www.teufert.net/

Adam1971 · 08-31-2018, 08:22 PM

Sorry to wake up a 12 year old post but 1 was wondering if you ever learned anything about your second code. I have a similar one:

1M0218
7VP

I’ve been looking for months and can’t find info on it.

ka_jd7and1 · 09-04-2018, 12:43 AM

1M should be GM of Mexico, so it is a crate engine.

The 7VP should be the engine suffix. I don't know of a good list for the newer stuff, maybe someone else can help out with that part.

05-22-2006, 08:39 PM	#1
tkeduk8r Senior Member Join Date: Apr 2001 Location: Alexandria, MN Posts: 1,462	small block engine decoding help... have these two small blocks and finally got around to getting the numbers off the pad on front of pass cyl head....first goes like this 16K431089 VO401CMJ 2nd looks like this 1M1011 7VP any ideas???? --Mike __________________ 63 C20 2WD, 230/SM420/4.11 73K 68 C30 dump truck, 327,SM425,4.56 66K original 68 C10 2WD SWB Stepper, 250/3-tree/3.73 66K.... Wifes 68 Buick Skylark Custom Conv., 350/TH400/2.56 In our family since '79 69 GMC 1500 SWB 2WD, 350/TH350/3.73 posi... 70 K10 SWB 4X4 4-sp,ps, pb, tilt, buckets, console, sliding back window (Need AC parts) WIP 72 Chevy K20 4x4 350/350/205/4.56 donor 72 Vette 350/M21/3.70 posi, triple black and super fast 84 Olds Cutlass Brougham 350/2004r/4.11 was Dad's

05-22-2006, 09:07 PM	#2
Oldtruckfanatic Truck junkie Join Date: May 2006 Location: Reno NV Posts: 697	Re: small block engine decoding help... The numbers on those pads are suffix codes I can't remember the exact details but seems to me they were stamped at the factory with a plant code maybe a date code and the last few numbers of the vin. I may be wrong but it's something to that effect. the casting numbers identifying the engine are on the bellhousing flange at the back of the engine on the drivers side. that number will tell you what the engine is as far as model years and hp ratings etc. Last edited by Oldtruckfanatic; 05-22-2006 at 09:08 PM.

05-23-2006, 12:08 AM	#3
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: small block engine decoding help... CMJ---1974 350 with T400-- out of a police car-4 bar.carb CMJ---1980 305 -auto-Camaro (will need to check casting # on back of block on driver side to see which) could not finf other one. __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer Last edited by jhow66; 05-23-2006 at 12:16 AM.

05-23-2006, 12:14 AM	#4
Oldtruckfanatic Truck junkie Join Date: May 2006 Location: Reno NV Posts: 697	Re: small block engine decoding help... Hey...I looked everywhere trying to find the suffix decoder but I could only find the casting decoder is that info online somewhere jhow66?

05-23-2006, 11:23 AM	#5
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Re: small block engine decoding help... Try here: http://www.teufert.net/ __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

08-31-2018, 08:22 PM	#6
Adam1971 Registered User Join Date: Feb 2017 Location: Muscle Shoals Al Posts: 7	Re: small block engine decoding help... Sorry to wake up a 12 year old post but 1 was wondering if you ever learned anything about your second code. I have a similar one: 1M0218 7VP I’ve been looking for months and can’t find info on it.

09-04-2018, 12:43 AM	#7
ka_jd7and1 is a fungineer Join Date: Jan 2009 Location: Bakersfield, CA Posts: 795	Re: small block engine decoding help... 1M should be GM of Mexico, so it is a crate engine. The 7VP should be the engine suffix. I don't know of a good list for the newer stuff, maybe someone else can help out with that part. __________________ 2003 S10, 2.2 auto- the daily driver, currently with a 2"/2" drop and some minor engine bolt-ons 1978 Impala 2-door, race 350/T350 - the new race car, in progress 1968 Chevy C10 longbed- 3/5 drop, currently undergoing a heart transplant



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