250 6cyl id

[55dude]

Guys i'm usually on 47-59 board but I picked up a engine and here are the casting numbers: 3921968, G253 and this I think means July 25th 1963 or 1973? And 64-76 250 and here are stamped numbers by dist. H0730PC, the bellhousing casting number is 3925505. The engine has the truck mounts so I believe thats whats it came in but would like to narrow it down thanks.

['68OrangeSunshine]

"PC" comes up as '68 or '69 250.
I don't have a code for "H". Could it be an "N" for Norwood [where ever the fxxx that was]? All my 292 cores are "F" for Flint, Mich.
There's more decoding data, specific to the Chevy L6, on www.inliners.org.

[55dude]

Thanks that is a start,where did you get the info to id the stamped numbers?
Posted via Mobile Device

['68OrangeSunshine]

From the LMC catalog. Not always the most reliable source, but it's handy.
There's more in Leo Santucci's "Chevy InLine Six Cylinder Power Manual''. He calls them Engine Dress Codes and also explains how to decode the cast-in numbers, too. He doesn't break down the dressed stamped 2-letter codes, though.
LMC's listing is incomplete.
I know I have the 292 that was in the truck when I bought it in June 1973. It's stamped F0627XAE. I pulled that block out and rebuilt a '67 292 [F0626UH] in 1977 -- ran it for 250,000 miles and then (2002) rebuilt the '68 block @ .030 over.
''UH'' is listed in the LMC list, but ''XAE'' is a mystery. My guess is it's a Manufacturers' warranty replacement for a lemon motor the original owner had to deal with. The guy I bought it from was the 2nd owner, at least. Maybe the 3rd.
Long time ago, now.

[pritch]

Originally Posted by '68OrangeSunshine

"PC" comes up as '68 or '69 250.
I don't have a code for "H". Could it be an "N" for Norwood [where ever the fxxx that was]? All my 292 cores are "F" for Flint, Mich.
There's more decoding data, specific to the Chevy L6, on www.inliners.org.

With that information, I would say '69. It is my understanding that GM didn't do the stamped numbers on trucks until '69.

['68OrangeSunshine]

Originally Posted by pritch

With that information, I would say '69. It is my understanding that GM didn't do the stamped numbers on trucks until '69.

Point of information, Brother [with respect]:
I have a '63 Model Year 292 L6 core. It's stamped FIII6PG.
(The ones look like capitol "I"-s , not numeral "1"-s) But it could mean Flint | I = Sept | II6... The last 3 digits have me puzzled. Does it mean 11th? 16th? There is an extra digit to unsolve. It could even be for Flint | March | 6th | Powerglide, but I can't say for sure.

I can understand '67 and '68 Model Years, [on which GM did stamp code numbers] but the code may be different earlier.
I know this is an original '63 block. It's Alpine Green, has a funny looking forward oil sump, tall lifter covers, and the casting numbers on the drivers side say 1962.

The last 2 or 3 letters are not necessarily year indicators, [even if LMC uses them that way] but tell the various crews down the assembly line what parts are wanted on this assembly.

Here's the rosetta stone on dress code letters:
http://www.NoQuarterChevySixInfo.no....com/index.html

[pritch]

That link won't open for me. I'd like to see it-I'll work on that later.

Awhile back, when I was deciding which way to go, I had 6 or 7 L6 blocks out in the shop, mostly 250/230's and a 292, and most (in fact all but one) did not have stamped numbers. When I asked about this several people told me about how GM didn't do that on trucks until '69. This was re-enforced when I found an original 292 out of a '69 K20 and it had the dress codes.

I never really gave it much thought after that. Maybe it's true-not everything you read on the interwebs is true

Good info, Orange!

['68OrangeSunshine]

Thanks,

Here's a better try at the link---

www.chuckthetruck.com

no25.chuchthetruck.com/index.html

The above 'slug' is how it reads out, but it won't link like that. So pull up Chuck The Truck, then select No Quarter Six Page, then p.3 engine codes.

[allons]

The 'N' is for Norwood, which is a suburb of Cincinnati. Norwood assembled the C/K trucks and the 'F' car (Camaro, Firebird). GM shut the plant probably 20 years, or more, ago.

['68OrangeSunshine]

Originally Posted by allons

The 'N' is for Norwood, which is a suburb of Cincinnati. Norwood assembled the C/K trucks and the 'F' car (Camaro, Firebird). GM shut the plant probably 20 years, or more, ago.

OK, thanks, but 55dude said it was a 'H'. I thought that may be a misread, but there is an "H"
I found out at :
www.chevymania.com
a lot more about suffix codes. 'H' on a block meant the Hydromatic division assembled the rotating assembly in the block. Apparently they weren't just into transmissions.
ChevyMania is all about the V8s and no L6 data, but he does explain casting codes and stamped-in suffixes.

['68OrangeSunshine]

Originally Posted by 55dude

Guys i'm usually on 47-59 board but I picked up a engine and here are the casting numbers: 3921968, G253 and this I think means July 25th 1963 or 1973? And 64-76 250 and here are stamped numbers by dist. H0730PC, the bellhousing casting number is 3925505. The engine has the truck mounts so I believe thats whats it came in but would like to narrow it down thanks.

Bellhousing 3925505 has the 5-1/8" I.D. for the SM465 manual tranny.
3921968 = 250 block, '62-'79
G253 = July 25th, 1963 [unless it's an '8' =1968*]
PC = 250, truck or Blazer, manual trans.
* Would they let a casting rest for 5 or 6 years? Then assemble it 5 days after its 5th [or 6th] anniversary? We'll probably find out who Jack the Ripper was before the General lets that mystery slip out.