Help with engine ID

[superhondaz50]

I was wondering if anyone can help me ID my engine. My truck is a 69 C-10, on the engine pad forward of the passenger side head my stamp is MG21400. Does anyone know what this stands for? I can't seem to find any info on this stamp. Any info would be appreciated.

Thanks!

[ETsC10]

That's a suffix code but I'm not seeing it on the chart I use...

http://www.nastyz28.com/gm-chevy-cod...s-suffix-6.php

[Leonard1]

Originally Posted by superhondaz50

MG21400

The first digit of the engine suffix code was the plant that produced the engine: V for Flint, Michingan, and T for Tonawanda, NY. The next 4 digits were the month and date of engine assembly, and the last 2 were the "suffix code" that told the exact application of the engine. What you posted doesn't follow the correct format; double check the code and post back, because I don't think I've ever seen a suffix code that starts with "O"

[JimKshortstep4x4]

There is something wrong with the code that you have posted. As mentioned the suffix code is at the last of the stamping not the first.

I have seen similar stampings like this on engines that have been decked and the builder stamps his initials and the date in the cleaned off pad.

Jim

[superhondaz50]

Ok I double checked, the engine stamp I posted IS correct. I found an engraving/stamp on the block above and to the right of the water pump. I drew up what is looks like in paint, its a "MG" stamp with a "WE" looking engraving under it ... Maybe this will help with the ID?

Thanks!

[bruceman1968]

Ryan, Hello and welcome to the board. My best guess is your engine has been rebuilt and when it was, the block was decked. I think after the rebuild the rebuilder stamped his stamp on the motor.

So let's hit this from a different angle. Can you get the casting number and the date code for us? The casting number is located on the engine flange that the bellhousing bolts up to. So is the date code. The casting number is on the driver side and the date code is on the passengers side.(top rear of block, back by the distributor).

Here is a pic of locations for casting numbers and date code.

[xb9rguy]

bruceman1968 thanks for that pic I've been wanting to find out for sure what motor is in my truck but never knew for sure which stamp was what and where.

[superhondaz50]

Ok, I climbed up into the engine bay today after work. On the drivers side rear it has a casting of "Hecho En Mexico 3970010". There is also a casting clock with a "D" and "N" on opposing sides of it. On the passenger side there is a casting of "F1478" but could easily be "FI478" or "FT478".

[bruceman1968]

Ryan, that's a 1978, 350.... The block was cast in mexico on june 14 1978. The 3970010 could be 2 or 4 bolt main. It's a good block.
date code= F1478
F= june
14= 14th Day
78= 1978

[superhondaz50]

Awesome! I appreciate the help guys!

[bruceman1968]

happy to help. Also your motor is a replacement engine/warrenty motor. your engine ID is consistant with that.
M= mexico
G= sorry, I don't know (can't find a break down for it)
21400= serial number

[Cdimedriver]

Hey guys..I could use some help with identifying my block . I have a 82 swb and the codes on the lip of the block behind the alternator read:

TA7552007
V0609TJW

I checked the z28 site but it was well.......CONFUSING. Any help would be appreciated. Mainly wandering wether i have a 305 or 350. Thanks Jay

[bruceman1968]

Jay, TJW is the code your after. I have it listed for 5 different years. In 71 and 72 it is a 307. In 73, 74 and 80 it is a 350. Check your date code to be sure.