No Engine ID # - The 1947 - Present Chevrolet & GMC Truck Message Board Network

TreverSlyFox · 12-02-2003, 12:41 PM

Got a 1971 GMC 3500 Dually with a 350cid, 4 speed granny 1st.

Was just looking at the engine the other day and happened to think to look at the engine # boss to record the numbers. Got the boss clean and low and behold NO NUMBERS!

Doesn't look to have been altered at all, just looks like no numbers have ever been stamped. Anyone ever run into this?

**CPNE** · 12-02-2003, 12:52 PM

Where are you looking? The #'s are cast in front of the bell housing on LH side. Check this site for more info

TreverSlyFox · 12-02-2003, 12:58 PM

Looking at the number boss that sticks out just below the right head. It's about 1" wide x 2" long with a machined surface on the top.

Looking at that site posted, it's the 4th position labeled as the ENGINE ASSEMBLY DATE/SUFFIX CODE and partial VIN code.

bpmcgee · 12-02-2003, 01:10 PM

Trever,

I'm not sure that every application had numbers stamped there. I believe that some did and some did not.

Hope this helps,

Brian

*67Fleetsidedream* · 12-02-2003, 03:12 PM

My block numbers were casted into the block and they were on the driver side. You may have grab a can of brake cleaner and a wire brush to see them....

boraxman · 12-02-2003, 03:15 PM

Quote:

Originally posted by bpmcgee
Trever,

I'm not sure that every application had numbers stamped there. I believe that some did and some did not.

Hope this helps,

Brian

Mine does not have anything stamped there (in front of head) either. Suppose to be a early 70s 350.

Hutch · 12-02-2003, 06:21 PM

I got this off of the mortec site:

Quote:

If the block has been previously "decked" by a machine shop, the engine assembly date and suffix codes, normally found on the passenger side front deck of the block, may have been removed by the machining process. They will be gone.

J.Lance · 12-02-2003, 06:25 PM

Like hutch said. If the numbers are missing, good chance it has been decked. Not such a bad thing, means it has at least been gone through. Sometimes the machinist might put there own mark or serial number there also. The width of the pad is also a good quick indicator whether it is an early block or not. A pad for a '71 should be about 3" long and not rectangular where a later block has a smaller pad and is cast square.

jhow66 · 12-03-2003, 12:09 AM

Could be a crate motor. Check the # behind driver side head to see what year this block was used.

12-02-2003, 12:41 PM	#1
TreverSlyFox Registered User Join Date: Sep 2003 Location: Houston, Missouri Posts: 17	No Engine ID # Got a 1971 GMC 3500 Dually with a 350cid, 4 speed granny 1st. Was just looking at the engine the other day and happened to think to look at the engine # boss to record the numbers. Got the boss clean and low and behold NO NUMBERS! Doesn't look to have been altered at all, just looks like no numbers have ever been stamped. Anyone ever run into this?

12-02-2003, 12:52 PM	#2
CPNE Resident Curmudgeon Join Date: Dec 1999 Location: NH Posts: 6,664	Where are you looking? The #'s are cast in front of the bell housing on LH side. Check this site for more info __________________ Currently on or near the homestead: 67 Chevy SWB 2WD stepside 350/3 on tree (Pat's) 67 GMC SWB 2WD Fleet 402/auto (Brian's under construction) 67 Chevy 3/4 ton 2WD 402/auto (Business Hauler) 67 Chevy 1 ton dually 2WD 396/4 speed (Former business hauler, Needs TLC) 68 Chevy 1/2 ton Suburban 2WD 250 six/3 on tree (Brian's Needs TLC) 70 Chevy 3/4 ton 4WD 350/4 speed (Pat's - Disguised as a 68 GMC) 71 Chevy SWB stepside (Crushed by tree - parts donor) 72 Chevy 3/4 ton 4WD (Parts donor) 72 Chevy 3/4 ton 4WD Suburban (Parts Donor) 72 GMC 3/4 ton 4WD 292 six/4 speed (Mine - Disguised as a 67 GMC) 81 GMC 4WD Dually Dump Body 350/4 speed (Business Hauler) 82 Camaro Z/28 355/Super T-10 (Pat's toy) 93 Caprice 9C1 (Brian's Cop Car) 02 Toyota Camry (Reliable but a souless steel and plastic hulk) 2011 2SS RS Camaro M6 Factory Hurst Shifter Maybe I need to sell some of this crap Yet another Bozo with a sawz-all

12-02-2003, 12:58 PM	#3
TreverSlyFox Registered User Join Date: Sep 2003 Location: Houston, Missouri Posts: 17	Looking at the number boss that sticks out just below the right head. It's about 1" wide x 2" long with a machined surface on the top. Looking at that site posted, it's the 4th position labeled as the ENGINE ASSEMBLY DATE/SUFFIX CODE and partial VIN code. Last edited by TreverSlyFox; 12-02-2003 at 01:26 PM.

12-02-2003, 06:25 PM	#8
J.Lance Too many is never enough! Join Date: May 2003 Location: Idaho Falls, ID Posts: 455	decked Like hutch said. If the numbers are missing, good chance it has been decked. Not such a bad thing, means it has at least been gone through. Sometimes the machinist might put there own mark or serial number there also. The width of the pad is also a good quick indicator whether it is an early block or not. A pad for a '71 should be about 3" long and not rectangular where a later block has a smaller pad and is cast square. __________________ Jason 1968 K10 SWB Fleetside 1971 K2500 GMC LWB 1968 K20 (later frame, donor body) 1972 C20 LWB parts truck 1993 K2500 Suburban, tow rig, 454, 4L80E NEW!! 18' Siem's car hauler 2004 Honda Odyssey (family man!)

12-03-2003, 12:09 AM	#9
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Could be a crate motor. Check the # behind driver side head to see what year this block was used. __________________ 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

12-02-2003, 01:10 PM	#4
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Trever, I'm not sure that every application had numbers stamped there. I believe that some did and some did not. Hope this helps, Brian

12-02-2003, 03:12 PM	#5
67Fleetsidedream Wiseass secured himself a BAN Join Date: Nov 2000 Location: MOON!!! Posts: 2,282	My block numbers were casted into the block and they were on the driver side. You may have grab a can of brake cleaner and a wire brush to see them....

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