350 SBC decoding

80GPLJ · Guru

350 SBC decoding

73SC · A Poncho Legend!

I got schooled by 67HEAVEN and Ghostpost on this:

K - McKinnon Industries, St Catherines ON

0130 - Jan 30th

C4N - 1982 267 CID 2bbl

Useage, A body, B body, Monte Carlo

80GPLJ · Guru

you sure about the 267 part? From info I gathered from a 350 book, 3970010, dip stick on drivers side for pre 1978 - it is definitely a 350, 1969-79

73SC · A Poncho Legend!

No, I just took my decoding lesson this week. Pete or Bob will know for sure. Is it blue?

Did you take off the oil pan to see the mains? 2 or 4 bolts?

C4N definitely shows up as a 267 but your other number does cross reference to the 350.

-- Edited by 73SC on Saturday 5th of September 2009 01:05:07 PM

2drpost · Uber Guru

sorry, but an 010 block is indeed a.....350! aww

what's the casting date, it's on the bellhousing flange, just aft of the distributor.

could be a 4 bolt block, 'most' i've seen were. an 8" balancer is a good indicator.

-- Edited by 69 belair on Saturday 5th of September 2009 01:09:38 PM

80GPLJ · Guru

Original I don't know, according to block # 3970010 it is a 327/350

73SC · A Poncho Legend!

80GPLJ wrote:

Original I don't know, according to block # 3970010 it is a 327/350

I agree with that but the suffix code C4N ? Of course being Canadian it might not be listed in the US publications.

-- Edited by 73SC on Saturday 5th of September 2009 01:25:21 PM

2drpost · Uber Guru

not a 327, that block was 350 only, although listed in CBTN as used for some '69 302s.
'69 blocks were 4 bolt mains, '70-'80 blocks could be 2 or 4 bolt, alot of truck usage later '70s.
rumor was these blocks were of higher nickel content, therefore a bit stronger.

the 267 had a tiny 3.5" bore(smaller than the original '55 265), with the 350s 3.48 stroke.

-- Edited by 69 belair on Saturday 5th of September 2009 01:19:43 PM

80GPLJ · Guru

2 bolt main it is, the block casting is the stumper if it is a 267

73SC · A Poncho Legend!

Can someone explain the K0130C4N meaning then. I know it is a GM Canada engine, does all that nickle stuff apply to different foundaries, remember most if not all US publications have no idea there was a foundry and plant in St. Catherines.

I'm feeling more confident in my assessment now that we know it is a 2 bolt combined with the engine code. Sorry cry

-- Edited by 73SC on Saturday 5th of September 2009 01:38:17 PM

Beaumont4008 · Uber Guru

That c4n code is a bit of a head scatcher .   I have a 010 block and its a 350 4 bolt main truck engine.   Code TKY 74 block. Got the info from the same place you did 73SC. Seems to match info in my case.

K0322   Mckinnon block March 22nd

4B28    cast date   74 Feb. 28th

TKY      74 Truck 4 bolt main.

One thing I have noticed that you can have the same code for different years for different engines. Example code CHA

1973 307

1975 350

1980 305

1980 350 (same year as 305 but different engine)

1988 305

Perhaps C4N was also but not noted in the online suffix list.

-- Edited by Beaumont4008 on Saturday 5th of September 2009 02:28:26 PM

StriperSS · Poncho Master!

Not to hijack this thread, but who can tell me what this block is?

73SC · A Poncho Legend!

Just as an aside, all trucks got 4 bolt mains right up until the end of small block production useage in 2005. So if you see a late model GMC or Chevy truck or any year for that matter in a slavage yard with a 350 it is worthwhile. The last two versions the L05 (1987 -1995) was primarily for trucks but it did get used in 9C1 Caprices and RWD Fleetwoods, optional on B Body wagons. It has 300 lb ft of tourque. In 1996 it became the L31 Vortec (1996 - 2005) with Vortec heads and intake, very powerful and lots of torque - 365 lb ft, My Suburban has this unit. They even used this in Top Kicks so that tells you something.

The 350 is still manufactured as a Goodwrench replacement crate engine and it uses 4 bolt main caps. This crate engine comes in several variations. The lowest priced uses the pre-1986 four-bolt casting molds with two dipstick locations; pre-1980 on the driver's side and post-1980 on the passenger's side. It is a good value imo.

Beaumont4008 · Uber Guru

TDJ code was for a 72 truck 350 and 1980 truck 350. You would need date code and block number to figure what year. Is it a 4 bolt main ?

Just a note, TDJ also shows for a 92 454. So you can see how Suffix codes can be confusing. Date code and block numbers more reliable I think.

-- Edited by Beaumont4008 on Saturday 5th of September 2009 02:42:30 PM

80GPLJ · Guru

Well, it's definitely a 350, took off base pan and measured the bore, 4" +, thank sbc gods for that!

StriperSS · Poncho Master!

Beaumont4008 wrote:

TDJ code was for a 72 truck 350 and 1980 truck 350. You would need date code and block number to figure what year. Is it a 4 bolt main ?

It's on the edge of my neighbors property. I'll have to flip it over and look.

73SC · A Poncho Legend!

80GPLJ wrote:

Well, it's definitely a 350, took off base pan and measured the bore, 4" +, thank sbc gods for that!

4"+ ? Bored out?

Still waiting for someone who knows to decode K0130C4N

73SC · A Poncho Legend!

Beaumont4008 wrote:

One thing I have noticed that you can have the same code for different years for different engines. Example code CHA

1973 307

1975 350

1980 305

1980 350 (same year as 305 but different engine)

1988 305

Perhaps C4N was also but not noted in the online suffix list.

I agree on multiple code useage but wouldn't you think by now every possible code for a 350 would have been documented ?

Hey 80GPLJ what type of vehicle did you pull this out of?

-- Edited by 73SC on Saturday 5th of September 2009 02:44:52 PM

80GPLJ · Guru

bought from a young fellow who intended on putting in his 91 Trans Am, not sure of origin, from location of dipstick it is a an early '78 to pre '78 block. The engine is bored 0.030 over

73SC · A Poncho Legend!

Once someone nails down the code K0130C4N we will know what it was originally installed in. No one has explained the suffix code yet confuse

It didn't come out of a truck since it is two bolt main caps as well truck engines usually have a really long dipstick tube plus a long oil fill tube fitted on one rocker arm cover.

-- Edited by 73SC on Saturday 5th of September 2009 04:06:20 PM

73SC · A Poncho Legend!

73SC wrote:

Once someone nails down the code K0130C4N we will know what it was originally installed in. No one has explained the suffix code yet

Bumping this this morning. For me I hope it is a 350 but I want to know for my own education. Someone who knows, please decode that engine code and especially that suffix code.

80GPLJ · Guru

I pulled the pan and checked bore, it is a 350 but the C4N suffix - possibly a goof at the factory?

67Poncho · Uber Guru

Oddly enough, Fred (68sd) hasn't chimed in on this one. I get him to decode mine for me!!!! Hopefully he will shed a little light on this as well...........

73SC · A Poncho Legend!

67Poncho wrote:

Oddly enough, Fred (68sd) hasn't chimed in on this one.

You know Fred, he's probably out at Jackson's or at a show taking photos of data tags. biggrin

67Poncho · Uber Guru

73SC wrote:

67Poncho wrote:

Oddly enough, Fred (68sd) hasn't chimed in on this one.
You know Fred, he's probably out at Jackson's or at a show taking photos of data tags.

NO, really???? confuse

Can't imagine that one bit at all!!!! wink

He probably has a VIP pass there!!! (lol)