350 SBC decoding

StriperSS · Poncho Master!

RE: 350 SBC decoding

80GPLJ · Guru

Same # as mine and in same location

Ghost Post · Poncho Master!

Just checking in from the sweetheart's computer and only have a moment..
I have none of my info here to confirm actual application by Suffix but will offer this..

'70 model year and newer Suffixes are 3 digit, '69 and earlier have two..
'70 and up Passenger car Suffixes begin w/ a C, trucks w/ a T..

A quick method to rough guess the year before looking up a Suffix or when the Suffix has mulitple year applications is by counting back 8 digits from the Vin stamp for the model year..

Above example C4N w/ Vin 181185545 casting # 3970010..
The 010 casting was used for many years and the higher nickle content always the rumor..
The 3 digit C suffix would indicate it's out of a '70 or newer car..
The 8 is the year digit so probably 1978..

The TDJ example obviously a '70 and newer truck..

Hope everyone's having a great long weekend!.

-- Edited by Ghost Post on Sunday 6th of September 2009 04:09:48 PM

73SC · A Poncho Legend!

Bumping this, Pete can you zero in on this one?

Ghost Post · Poncho Master!

There is a listing for Suffix C4N but it's from 1982 and is a 267 so wouldn't be the 010 casting?.
Something seems amiss so please clean and carefully check # again also casting dates and report back..
It's not CE something is it?.
CE are's over the counter engines..

Here's the Suffix info anyway..

Suffix C4N

1982 - 267 - L39 - 2Bbl
Used in A & B Body cars also Montes

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Vin 181185545

1 = Chevrolet
8 = 1978
1= Oshawa assembled vehicle
185545 = Sequential 6 of Vin

---------------------------------------------------

Suffix TDJ

StriperSS above is correct..
Both could be 010 so check casting dates..
Is the Suffix pad the older style long one or short more protruding newer style?.

TDJ = 1972 350 Auto - 175Hp 4Bbl - C-10 & 20
TDJ = 1980 350 Auto - 155Hp 4Bbl - C-10 to 2500 Van/Bus

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Either way I believe all 010 castings are 4" bore so if a 3 digit is '70 and newer so would be 350 cranks since the 302 and 327's were gone for '69..

-- Edited by Ghost Post on Tuesday 8th of September 2009 01:12:20 PM

Beaumont4008 · Uber Guru

For the TDJ block the date casting date on the side of the block would help to tell if 72 or 80.

267 blocks are 14010280, 14016376, and 471511 from 79 to 82. I would say that incorrectly stamped or C4N also used for 78 350 but not recorded on list we are looking at. But like you said verify if is C4N for sure.

80GPLJ · Guru

YES I VERIFIED THE BLOCK #, PAD# AND BORE SIZE. NOT MUCH MORE TO DO. IT MUST HAVE BEEN A MISPRINT AT FACTORY.

80GPLJ · Guru

bump - check this thread

68sd · Canadian Poncho Superstar!

C4A	1984	305	Roch E4ME carb.	H LG4	150	4	B F G/Impala
C4B	1984	305	Roch E4ME carb.	H LG4	150	4	B F G
C4C	1984	305	Roch E4ME carb.	H LG4	150	4	B F G/Omega
C4D	1984	305	Roch E4ME carb.	H LG4	150	4	B F G/Omega
C4N	1982	267	Roch E2ME carb.	J L39	-	2	A B/Monte
C4P	1985	305	Roch E4ME carb.	H LG4	150	4	B F/Monte
C4R	1982	267	Roch E2ME carb.	J L39	-	2	B G
C4R	1985	305	Roch E4ME carb.	H LG4	150	4	B
C4S	1982	267	Roch E2ME carb.	J L39	-	2	B
C4T	1982	267	Roch E2ME carb.	J L39	-	2	B G/Omega
C4U	1982	267	Roch E2ME carb.	J L39	-	2	B G
C4W	1982	267	Roch E2ME carb.	J L39	-	2	B G/Impala
C4W	1984	305	Roch E4ME carb.	H LG4	150	4	F B/Omega

68sd · Canadian Poncho Superstar!

doesnt add up,but anything can happen in canada?
Engine suffix codes are reused decade after decade and nobody had record of them all,especially canada,so maybe that code was reused in 1980 and noboby has record of it being used befor 1980
maybe on a 2 bolt main 350 made in canada between 70 and 79

267s are

14010205 -80-82
14010280-80-82
14016376-80-82

partial Vin # 181185545
1=Chevy
8= 1978
1=oshawa
185545 =start of vehicle vin #

older motors have longer pads almost the whole lenght of the front of the head ,newer 80s have short pades were the suffix code is

-- Edited by 68sd on Wednesday 2nd of December 2009 10:38:21 AM

-- Edited by 68sd on Wednesday 2nd of December 2009 10:41:55 AM

68sd · Canadian Poncho Superstar!

there should be a date code on the back by the 0010

A is January
B is Febuary
C is March
etc......

next 2 digits is date of month (ie 20)

3dr is last number of year ,ie 9 (1979)

-- Edited by 68sd on Wednesday 2nd of December 2009 10:31:31 AM

68sd · Canadian Poncho Superstar!

CID   Year   Bore   Main Cap
262   1975           3.671   2 bolt ONLY
267   1979 - 81   3.500   2 bolt ONLY
305   1976 - 96   3.736   2 bolt ONLY
307   1968 - 73   3.875   2 bolt ONLY
327   1968-69     4.001 (2.3" main)   2 bolt
350   1968-88     4.001 (2.3" main)   2 bolt
265   1994          4.001 (2.45" main)   2 bolt
302   1968-69    4.001 (2.45" main)   4 bolt
350   1968-96    4.001 (2.45" main)   4 bolt
400   1970-72    4.126 (2.65" main)   4 bolt
400   1973-80    4.126 (2.65" main)   2 bolt

ak 67sd · Poncho Master!

according to mortec its

3970010....302.....69....4...Z-28 Camaro
3970010....327.....69....2...Trucks and industrial
3970010....350...69-80...2 or 4

wouldn't it be nice if its 4bolt main and the date codes etc. come up with 1969 z28!!