292 Engine Code

[Seanext]

I have searched every site I can find and I am still unclear how to decode these numbers. This engine is in a 71 K10. I am now pretty sure it is not the original engine. This is what I have so far:

Casting number
3921970 66-76 292

con 2
conveyor 2

J 12 7
Oct 12th ?

Distributor pad
F1117UA
Flint plant ???? ??
Nov 17

The two date codes do no match in the casting date and the date stamped on the pad.

Any help would be greatly appreciated. Getting ready to rebuild this engine just want to make sure to order the correct parts.

['68OrangeSunshine]

I'm gonna guess that it's a '67 or '68 [Model Year] and that the "UA" you see is a bad strike for UH, UR, UP, or UN. "J 12 7" = Oct 12th 1967.
I have an engine in my '68 C/10 Stepside that's stamped F0627XAE. I know it's the original 292 engine, at least since I bought the truck in 1973. I also had a core 292 that I ran for 25 years, pulled out of a '67 ex-Forest Service stepside that's stamped F0626UH.
My "UH" is on the charts but I could never get a read on "XAE". Then again, yours could be a perfect UA and our knowledge base is too limited to learn more.
The '67 and '68 Flint L-25 292 L6 blocks were good pieces, and the 12-lobed crank was the perfected design.

[bruceman1968]

Originally Posted by Seanext

I have searched every site I can find and I am still unclear how to decode these numbers. This engine is in a 71 K10. I am now pretty sure it is not the original engine. This is what I have so far:

Casting number
3921970 66-76 292 correct

con 2
conveyor 2 correct

J 12 7 = Block cast date
J = Oct
12 = 12th
7 = 1967

Distributor pad
F1117UA
F= Flint motor assembly plant
1117 = Nov 17 assembly date
UA = 292ci, 170hp, 1bbl, manual trans


The two date codes do no match in the casting date and the date stamped on the pad.

Any help would be greatly appreciated. Getting ready to rebuild this engine just want to make sure to order the correct parts.

Your engine is a 1968MY, 292. The block was cast on Oct 12, 1967 and the engine was assembled on Nov 17, 1967.

[bruceman1968]

Originally Posted by '68OrangeSunshine

I'm gonna guess that it's a '67 or '68 [MY] and that the "UA" you see is a bad strike for UH, UR, UP, UN.
I have an engine in my '68 C/10 Stepside that's stamped F0627XAE. I know it's the original 292 engine, at least since I bought the truck in 1973. I also had a core 292 that I ran for 25 years, pulled out of a '67 ex-Forest Service stepside that's stamped F0626UH.
My "UH" is on the charts but I could never get a read on "XAE". Then again, yours could be a perfect UA and our knowledge base is too limited to learn more.

Orange, I have UA suffix code used in 55 and 56 for the 235 and from 65 to 68 for the 292.
I've been looking for your XAE code for the past 2 years. Even written several expert numbers men and still nothing. Have you ever checked the date code on your block? I'm curious to see if it's 67 or 68 or maybe even 66?

['68OrangeSunshine]

Originally Posted by bruceman1968

Orange, I have UA suffix code used in 55 and 56 for the 235 and from 65 to 68 for the 292.
I've been looking for your XAE code for the past 2 years. Even written several expert numbers men and still nothing. Have you ever checked the date code on your block? I'm curious to see if it's 67 or 68 or maybe even 66?

It's a '68 by anatomy, has the 12-lobe crank and bluff rear sump oil pan, also has A.I.R. holes in the head, and I know where it's been since June 1973. I'll have to pull the casting date code when I get a chance. I'm wondering if the Original Owner had the L-25 replaced under warranty, before the next owner [my PO] got it?
I guess you have a better decoder than the LMC catalog offers?

['68OrangeSunshine]

F0627XAE
CON 2
SHIFT 7 O'Clock
F 25 8
3921970

[Seanext]

As always you guys are awesome. Thanks for the help.

['68OrangeSunshine]

I've built both above-mentioned 292s, bored .030 over to 296 CuIn. Last build [XAE] I used a Crane 260H cam, Badger cast pistons*, and larger intake valves [1.84"] with hardened seats. On both I ran an Offy intake and Clifford headers. I had a Holley 390 CFM 4 barrel on [UH] but after 25 years, it was shot, so I went with an Edelbrock 1404 500 FCM 4 barrel on the XAE rebuild.
Take it to the machinist for a mag flux and to see if it's not cracked. Then greenlight your rebuild.
[* In 1977 when I built "UH" up, I was able to get TRW forged 292-.030 pistons, but they're not in the auto parts business now. Forged 292 pistons are custom jobs and as such are real expensive.]

[bruceman1968]

Originally Posted by '68OrangeSunshine

It's a '68 by anatomy, has the 12-lobe crank and bluff rear sump oil pan, also has A.I.R. holes in the head, and I know where it's been since June 1973. I'll have to pull the casting date code when I get a chance. I'm wondering if the Original Owner had the L-25 replaced under warranty, before the next owner [my PO] got it?
I guess you have a better decoder than the LMC catalog offers?

Much better, but still not complete. I'll Pm you a link. The one clue I have got on your XAE is possible pilot truck, but you would have several very early date codes on your truck parts if that were the case. And a unusual vin to boot. Replacement block is a very good possibility and also and more likely. It's a white elephant for me and one day we'll figure it out! I still don't think it's a mis stamp.

[factorystock]

The UA code is correct for 1967 292 170 hp with manual trans. The UA code does come up for other year 292's, but your block build date is 1967.

[factorystock]

Originally Posted by '68OrangeSunshine

but I could never get a read on "XAE".

Might be a bad strike on that one, maybe AXB? AXA AXB AXC AXD come out as 1989 292 115 manual trans

['68OrangeSunshine]

Originally Posted by factorystock

Might be a bad strike on that one, maybe AXB? AXA AXB AXC AXD come out as 1989 292 115 manual trans

XAE is very clear. Also the Orange Stepside was only 5 years old when I bought her in 1973. And the L-25 292 F0627XAE was the original engine as far as I know.

['68OrangeSunshine]

Originally Posted by bruceman1968

Much better, but still not complete. I'll Pm you a link. The one clue I have got on your XAE is possible pilot truck, but you would have several very early date codes on your truck parts if that were the case. And a unusual vin to boot. Replacement block is a very good possibility and also and more likely. It's a white elephant for me and one day we'll figure it out! I still don't think it's a mis stamp.

VIN PM'ed.