The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 11-28-2020, 01:27 PM   #1
Premium72
Registered User
 
Premium72's Avatar
 
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
Need help decoding block

Looking to ID the engine we pulled out of one of my Grandads GM trucks.
was a 69 flat bed dually truck

casting # ML 24800
Attached Images
   
Premium72 is offline   Reply With Quote
Old 11-28-2020, 01:47 PM   #2
71CHEVYSHORTBED402
Senior Member
 
71CHEVYSHORTBED402's Avatar
 
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,291
Re: Need help decoding block

3970010 https://www.mortec.com/castnum.htm

Not sure how to decode ML24800, but some do.
__________________
Tony
71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025
71CHEVYSHORTBED402 is offline   Reply With Quote
Old 11-28-2020, 01:50 PM   #3
Premium72
Registered User
 
Premium72's Avatar
 
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
Re: Need help decoding block

thnx

Last edited by Premium72; 11-28-2020 at 01:57 PM.
Premium72 is offline   Reply With Quote
Old 11-28-2020, 01:57 PM   #4
Premium72
Registered User
 
Premium72's Avatar
 
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
Re: Need help decoding block

so.. from that

3970010....327.....69....2...Trucks and industrial
small or large journal?
Premium72 is offline   Reply With Quote
Old 11-28-2020, 02:11 PM   #5
Warrens69GMC
Registered User
 
Warrens69GMC's Avatar
 
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
Re: Need help decoding block

3970010 is the most common SBC from the very late 60's to 1979, and 99.9% are 350's
Warrens69GMC is offline   Reply With Quote
Old 11-28-2020, 02:17 PM   #6
Getter-Done
Senior Member
 
Getter-Done's Avatar
 
Join Date: Dec 2009
Location: TN.
Posts: 8,300
Re: Need help decoding block

This link below has ML .


ML 1967 327 air cond. 275 4 F X
ML 1968 327 s h/p 325 4 Chevy II

Link:http://www.gregwapling.com/hotrod/mo...rs-hr-tbs.html

Most of the time the first letter is Plant.
From this link:https://nastyz28.com/sbchevy/sblock.html

Code Engine Plant Code Engine Plant
F= Flint (Motor) S= Saginaw Service
H= Hydramatic T= Tonawanda
K= St. Catherines, Ontario(McKinnon Industries Canada) V= Flint (Engine)

M= GM of Mexico









.
__________________
________________________________________________________________________________________
____________________________________________
84 Chevy K-20
63 Impala (my high school car)


http://67-72chevytrucks.com/vboard/s...Crew Cab Build
Getter-Done is offline   Reply With Quote
Old 11-28-2020, 02:24 PM   #7
gmc684x4
Registered User
 
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
Re: Need help decoding block

Warren is correct almost all 10 blocks are 350 ci

To inspect further you will need to pull the oil pan and see what crank number you have to fully id weather 350 or truck 327

Its a large journal block
gmc684x4 is offline   Reply With Quote
Old 11-28-2020, 02:24 PM   #8
Premium72
Registered User
 
Premium72's Avatar
 
Join Date: Sep 2005
Location: Villa Rica Ga
Posts: 889
Re: Need help decoding block

pulling pan.. :-D
Premium72 is offline   Reply With Quote
Old 11-28-2020, 04:33 PM   #9
Warrens69GMC
Registered User
 
Warrens69GMC's Avatar
 
Join Date: Jan 2003
Location: Safford,AZ
Posts: 3,612
Re: Need help decoding block

Made in mexico block is surely a goodwrench motor from the 70's
Warrens69GMC is offline   Reply With Quote
Old 11-28-2020, 05:41 PM   #10
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 529
Re: Need help decoding block

Check for the original paint on the block, but best bet is an older (probably 80’s vintage?) GM Targetmaster replacement block/engine. That is a generic casting number that will only you basic idea of engine. It was used for early 327’s and 350’s starting in 69(?) on up to the late 70’s in passenger cars. It also the reason the head pad has a weird stamped number. Normally they would read as a series of letters and number like listed in the nastyz28 site. To the left of the number would be partial VIN for the vehicle it was installed in if a factory installed engine. The alpha-numerical sequence where yours starts with an “m” would tell you the engine foundry/assembly plant, what plant it was installed into a vehicle at. That most definitely is not an original engine from the factory. Probably a crate or GM dealer, non-warranty replacement.

Side note though, if you find and engine you have an issue decoding, email the casting and head pad stamping numbers to the GM Heritage Center. It will take a few weeks, but they will email you back to confirm year/make/model, engine specs and where assembled/installed. I have done it for a couple of engines now and they are more than happy to help you out.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof
rechinca is offline   Reply With Quote
Old 11-28-2020, 08:20 PM   #11
gmc684x4
Registered User
 
Join Date: Jul 2012
Location: Whitehorse yukon
Posts: 1,218
Re: Need help decoding block

This casting number was common in trucks 69 to 79 was the last year they used this casting number
gmc684x4 is offline   Reply With Quote
Old 11-28-2020, 09:22 PM   #12
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
Re: Need help decoding block

It's all about the stamped #, not the embossed casting #. But usually it's the suffix code. This is a prefix code. Does that mean it's a Mexican block?
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
special-K is offline   Reply With Quote
Old 11-28-2020, 10:49 PM   #13
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 529
Re: Need help decoding block

Quote:
Originally Posted by special-K View Post
It's all about the stamped #, not the embossed casting #. But usually it's the suffix code. This is a prefix code. Does that mean it's a Mexican block?
Except in this case for the casting (and most GM crate motors now) that have Made In Mexico cast above the normal casting number on the back. In that case its more about the casting out of the gate as that, as far as I have seen, where that cast into the block will tell you the it was never a factory installed block and most likely not a warranty block/engine.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof
rechinca is offline   Reply With Quote
Old 11-29-2020, 07:05 AM   #14
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
Re: Need help decoding block

I guess prefix means replacement block. Now I see the Made In Mexico embossed above the casting number. So in this case we can somehow identify the block by the casting number? Or is it since it is a replacement block it can't be identified as from any particular model?
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
special-K is offline   Reply With Quote
Old 11-30-2020, 01:19 AM   #15
rechinca
Senior Member
 
rechinca's Avatar
 
Join Date: Jul 2018
Location: Vacaville, CA
Posts: 529
Re: Need help decoding block

Special-K what I found in lots of downtime reading at work this summer, is those Made In Mexico blocks with the stamping in the head pad that begins with an “M” are untraceable as far as what they went in. They have no partial VIN nor the engine plant / vehicle assembly plant stampings. It is more of a serial number than anything with no VIN. Again that is just what I discovered researching engine stamping/castings. I’ll try and shoot the GM Heritage Center an email just to pick their brains.
__________________
1971 Custom/10 - 350/3 speed, Orange/White roof
rechinca is offline   Reply With Quote
Old 11-30-2020, 06:31 AM   #16
special-K
Special Order

 
special-K's Avatar
 
Join Date: Nov 2004
Location: Mt Airy, MD
Posts: 85,852
Re: Need help decoding block

Good info so far. Thanks
__________________
"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"

GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim

"Don't call me a redneck. I'm a rough cut country gentleman"

R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
special-K is offline   Reply With Quote
Old 11-30-2020, 02:00 PM   #17
MARKDTN
Registered User
 
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,159
Re: Need help decoding block

The 010 block first year is 1969. It is always a large journal crankshaft, so 327 and 302 (Z28) in 69 and 350 69-80. Pre-68 327s were small journal cranks and 68 327s/302s used a different block casting. 010 blocks can be either 2 or 4 bolt mains. Pretty sure none of the 69 302 or 327 blocks were cast in Mexico.

More than likely a 350 Targetmaster over the counter engine.
__________________
'83 K20-TPI
'73 C10
'79 C10-ex-diesel(SOLD)
'07 Tahoe(Son driving)
'14 Suburban-DD
'71 C10-current project
MARKDTN is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:47 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com