History of the Stovebolt 6 Engine

horsepower | casting codes | head-bolt patterns | side/valve covers

1954Advance-Design.com

1929-1962
Chevrolet L-6 (in-line 6) Overhead Valve Engines

the Stovebolt Six - the Cast-Iron Wonder


casting codes
sequence/serial numbers


the information below was obtained from

Block codes and series/sequence codes from Beck's Machine & Tool on Inliners International

Truck sequence/series codes/pre-fixes are nicely presented by John Milliman on The Stovebolt Page

Keith Hardy ( The Old Car Manual Project ) kindly hosts GM engine serial number prefixes and suffixes

1929-1932 car identification from the Filling Station

Much of the First-Generation information was obtained from Mike Boteler

GM Canada casting codes and serial numbers 1916-1984 from the 1937 Chevrolet page

1929-1954 Model Serial Indentification from Keeith Hardy's OLD ONLINE CHEVY MANUALS



In the tables below

B: is the Block casting number
H: is the Head casting number
Serial/Sequence numbers = engine serial/sequence number
- includes the model/series-prefix to the engine serial number before 1954; or
- includes the model/series prefix and suffix from 1954 and later
This code is pressed into the ledge in the block that is just to the rear of the distributor

Pass = Passenger car

locations of casting codes and serial numbers (pre-1954)
locations of casting codes and serial numbers (1954-1963)


First Generation 1929-1936

Low-Pressure Oil System (internal lubrication) -   1931-35 engine cover-page & engine-specifications
most of the information in this First Generation table was kindly provided by Mike Boteler
(1935 Master Technical Advisor for the Vintage Chevrolet Club of America, VCCA)

Year
Truck
& Pass
engine
size
B: Block casting code
H: Head casting code
Ser # and Engine Serial # are Engine Serial Number codes or links to codes
1929
194 c.i.
Block: 835501
Head: 835503
Engine Serial #  Series AC, LQ
1930
194 c.i.
Block: 835501
Head: 836273, 836275
Engine Serial #  Series LD LR LS
1931
194 c.i.
Block: 836409
Head: 836273, 836275
Engine Serial #  Series AE, LT, MA, MB, MC, MD
1932
194 c.i.
Block: 836573
Head: 836718
Engine Serial #  Series BA, BB, NA, NB, NC, ND
1933
207
(206.8)
c.i.
Block: 837231 CA Passenger - Eagle
Block: 836915 CB 1 Ton Truck, Sedan Delivery, OA OB OC OD 1.5 ton trucks
Head: 836961 CA Master (and others ?)
Note: the 1933&1934 837231 Heads have the same casting for both years, but a different part number in each year.
Engine Serial #  Series codes
181 (c.i.)
Block: 473180 CC Passenger-Standard
Head: 600569 CC Passenger-Standard
Engine Serial #  Series codes
1934
207
(206.8)
c.i.

Block: 837231 DA Passenger, Sedan Delivery, Master, DB 1/2 ton truck, PA PB PC PD 1.5 ton trucks
Head: 836961 DA Passenger, Sedan Delivery, Master, DB 1/2 ton truck, PA PB PC PD 1.5 ton trucks
Note: the 1933&1934 837231 Heads have the same casting for both years, but a different part number in each year.
Engine Serial #  Series codes
181 c.i.
Block: 473741 DC Passenger Standard
Head: 473740 DC Passenger Standard
Engine Serial #  Series codes
1935
207
(206.8)
c.i.
Block: 837591
Head: 837230 (used up to serial #4783316, early April 1935) - identified by having 15 long head bolts.
Head: 837682 (the "Late Head" - identified by having 8-long and 7-short head bolts)
Engine Serial #  Series codes
1936
207
(206.8)
c.i.
Block: 836010
Head: 837981
Engine Serial #  Series codes
Ser #: 1936 truck serial numbers


Second Generation 1937-1953 216
& 1941-1953 235

Low-Pressure Oil System (internal lubrication)

Year
Truck
&
Pass
216
Block: Block code
Head: Head code
Ser # and Engine Serial # are Engine Serial Number codes or links to codes
Truck
&
Pass
235
Block: Block
Head: Head
Ser # and Engine Serial # are Engine Serial Number codes or links to codes
1937
216 c.i.
Block: 838101, 838710
Head: 838355 (early), 838773
Ser #: 1 to 1187821


1938
216 c.i.
Block: 838710
Head:
Ser #: 1187822 to 1915446 & B1 to B10502


1939
216 c.i.
Block: 838941
Head: 838773
Ser #: 1915447 to 2697267 & B10503 to B105461


1940
216 c.i.
Block: 839132
Head: 838773
Ser #: 2697268 to 3665902 & B105462 to B229135


1941
216 c.i.
Block: 839400Head: 839401
Head:
Ser #: AA 100S to AA 1163720 & AC 1001 to AC 19549
additional serial number information at this link
235 c.i.
Block: 3660439
Head: 839401
S: AG, AL
Ser #, Ser #: WWII
1942
216 c.i.
Block: 839770, 839910, 3835335
Head: 839401
Ser #: 2AA, 2AC, BA
additional serial number information at this link
235 c.i.
Block: 839751, 839931
Head: 839401
S: BG, BL
Ser #Ser #: WWII
1943
216 c.i.
Block: 839770, 839910, 3835335, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 839401
Ser #: WWII - military car but no domestic 216?
235 c.i.
Block: 839751, 839931
Head:
Ser #: WWII
1944
216 c.i.
Block: 839770, 839910, 3835335, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 839401
Ser #: WWII - military car but no domestic 216?
235 c.i.
Block: 839751, 839931
Head:
Ser #: WWII
1945 216 c.i. Block: 839770, 839910, 3835335, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 839401
Ser #: WWII - military car but no domestic 216?
235 c.i. Block: 839751, 839931
Head:
Ser #: WWII
1946
216 c.i.
Block: 839770, 839910, 3835335, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 839401
Ser #: DA
235 c.i.
Block: 839751, 839931
Head: 839401
Ser #: BG, BL-1st design;
DDA, DDM, DEA, DEM-2nd design
1947
216 c.i.
Block: 839770, 839910, 3835335, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 839401
Ser #: EA
235 c.i.
Block: 3835335, 839751, 839931
Head: 839401
Ser #: EDA, EDM, EEA, EEM
1948
216 c.i.
Block: 3835253, 3835497, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 839401
Ser #: FA
235 c.i.
Block: 3835309, 839931
Head: 839401
Ser #: FDA, FDM, FEA, FEM
1949
216 c.i.
Block: 3835253, 3835497, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 3835409
Ser #: GA
235 c.i.
Block: 3835309, 839931
Head: 3835409
Ser #: GDA, GDM, GEA, GEM
1950
216 c.i.
Block: 3835497, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 3835517,
Ser #: AHCA, AHCM, BHCA, BHCM, HAA, HAM, HAC, HAP, HBA, HBM, HCA, HCM, HCD, HCQ
235 c.i.
Block: 3692703 Pass Powerglide
Block: 3835499 3692713 Truck
Head: 3835909, 3835499
Ser #: HEA, HEM, HDA, HDM
1951
216 c.i.
Block: 3835497, 3837012 (Pass),
Block: 8335794 (Truck)
Head: 3835517
Ser #: AJCA, AJCM, BJCA, BJCM, JAA, JAM, JAC, JAP, JBA, JBM, JCA, JCM, JCD, JCQ
235 c.i.
Block: 3692703 Pass Powerglide
Block: 3692713 Truck
Head: 3835909, 3835499
Ser #: JDA, JDM, JEA, JEM
1952
216 c.i.
Block: 3835849, 3835794
Head: 3835517
Ser #: AKCA. AKCM, BKCA, BKCM, KAA, KAM, KAC, KAP, KBA, KBM, KCA, KCM, KCD, KCQ
235 c.i.
Block: 3835692 Powerglide/Truck,
Block: 3692713 Truck
Head: 3835909, 3835499
Ser #: KDA, KDM, KEA, KEM
1953
216 c.i.
the last 216 (all 216s had low-pressure lubrication)
Block: 3835849
Head: 3835517
Ser # (see right, below): ALCC. ALCP, BLCC, BLCP, LAG, LAT, LAJ, LAV, LBA, LBM, LCA, LCM, LCC, LCP, LCD, LCQ, LCH, LCU
235 c.i.
truck
low-pressure
the last low-pressure 235
Block: 3701946, 3701483
Head: 3701887
Ser # (see below): LDA, LDM, LEA, LEM, LAA, LAM, LAC, LAP
1953
235 c.i.
PG car
high-pressure 235 - the first Blue Flame Six
Block: 3701481 Powerglide (PG)
Block: 3701481 (Corvette, until about 16 Oct 1953)
Block: 3835911 (Corvette after 16 Oct 1953)
Head: 3838066 (Corvette)
Ser #: LAE & LAR w/Power Steering
LAF w/Aluminum Timing Gears
LAQ w/Powerglide Transmission
LAS w/Powerglide Transmission & Power Steering
Ser # (see right):
1953 car & truck ser #


Third Generation 1954-1962 235 & 261
High-Pressure Oil System (internal lubrication)

Year
Truck
235
(gray)
&
Pass
235
(blue)
Block: Block code
Head: Head code
Engine Serial # are Engine Serial Number codes or links to codes
Truck
261
Block: Block
Head:
Engine Ser #

1954
235 c.i.
truck
Block: 3701481, 3702436, 3835911
Head: 3835913
Engine Ser # T54 OR F54 FOLLOWED BY: L, LA, M, MA, MB, N, P, Q, R, S, T, TA, U, UA, UB, X, XZ, XB, Y, YE, YG, Z, ZC, ZE, ZH Pass??
261 c.i.
Block: 3703414, 3702436, 3703414
Head: 3635499 ???, 3703570, 3836850
Engine Serial #
F54Q, T54Q (5000 series)
F54N, T54N (6000 series)
235 c.i.
car
Block: Powerglide, Pass: 5845363 (PG?)
Block: 3835911 (Corvette), (and, maybe 3701488)
Head: 3836241 (Corvette)
Engine Serial #
1955
235 c.i.
truck
Block: 3733949 (1st series)
H: 3835913 (1st series)
Block: 3836233 (2nd series)
Engine Serial # 1955-1st series
Engine Serial # 1955-2nd series
261 c.i.

Block: 3733950, 3836340, 3837012
Head: 3703570, 3836850

Engine Serial # 
1955-1st series:
F55Q, F54Q55 (5000 series)
F55N, F54N55 (6000 series)

Engine Serial #
1955-2nd series:
F255N. T255N (6000 series)

235 c.i.
car
Block: 3835911
Block: Powerglide: 3702436, 3838004 (Beck's and Inliners) or 3837004 (Hemmings/ChevyTalk),
Head: Pass & Powerglide: 3835913
Block: Corvette: 3835911
Head: Corvette: 3836241
Engine Serial # Z, ZC (HD clutch), Y (Powerglide), YG (Corvette), ZH (Aluminum cam gear), ZJ (HD clutch & cam gear)
1956
235 c.i.
truck
Block: 3836233, 3764476; 3838004 (Beck's and Inliners) or 3837004 (Hemmings/ChevyTalk)
Head: 3836848
Engine Serial # X, XA, XB; XG, XGA & XGB (Hydra-Matic); W, WA; V, VA, VB (HD clutch); UA, UB , UD
261 c.i.
Block: 3733950, 3836340, 3837012, 3738813
Head: 3703570, 3836850
Engine Serial #  F56TA, F56TD (P.T.) (6000 series)
235 c.i.
car
Block: 3836233, 3764476; 3838004 (Beck's and Inliners) or 3837004 (Hemmings/ChevyTalk)
Head: 3836848
Engine Serial # X, XA, XB; XG, XGA & XGB (Hydra-Matic); W, WA; V, VA, VB (HD clutch); UA, UB , UD
1957

235 c.i.
truck
Block: 3764476;
Head: 3836848
Engine Serial #  H, HD (Hydra-Matic), HE (HD clutch), J (Updraft carb), JA (Updraft carb & Hydra-Matic)
261 c.i.
Block: 3733950, 3836340, 3837012
Head: 3703570, 3836850
Engine Serial # K
235 c.i.
car
Block: 3838004 (Beck's and Inliners) or 3837004 (Hemmings/ChevyTalk)
Head: 3836848
Engine Serial # A (3-speed), AD (HD clutch), B (Powerglide)
1958

235 c.i.
truck
Block: 3764476, 3738307, 3769716, 3739716;
Head: 3836848
Engine Serial #
261 c.i.
Block: 3836340, 3739365 (Jim Carter), 3759365, 3769717
Head: 3836850
Engine Serial #
235 c.i.
car
Block: 3738307
Head: 3836848
Engine Serial #
1959

235 c.i.
truck
Block: 3764476, 3738307, 3769716, 3739716
Head: 3836848
Engine Serial #
261 c.i.
Block: 3836340, 3739365 (Jim Carter), 3759365, 3769717, 3769925
Head: 3836850
Engine Serial #
235 c.i.
car
Block: Pass: 3738307
Head: 3836848
Engine Serial #
1960

235 c.i.
truck
Block: Truck: 3764476, 3769716, 3739716;
Head: 3836848
Engine Serial #
261 c.i.
Block: 3836340, 3739365 (Jim Carter), 3759365, 3769717, 3769925, 3769923
Head: 3836850
Engine Serial #
235 c.i.
car
Block: Pass: 3738307
Head: 3836848
Engine Serial #
1961

235 c.i.
truck
Block: Truck: 3764476, 3769716, 3739716;
Head: 3836848
Engine Serial #
261 c.i.
Block: 3836340, 3739365 (Jim Carter), 3759365, 3769717, 3769925, 3769923
Head: 3836850
Engine Serial #
235 c.i.
car
Block: Pass: 3764476, 3769716, 3739716;
Head: 3836848
Engine Serial #
1962
235 c.i.
truck
Block: Truck: 3764476, 3769716, 3739716;
Head: 3836848
Engine Serial #
261 c.i. Block: 3836340, 3739365 (Jim Carter), 3759365, 3769717, 3769925, 3769923
Head: 3836850
Engine Serial #
235 c.i.
car
Block: Pass: 3764476, 3769716, 3739716;
Head: 3836848
Engine Serial #

notes:

1. All 216 engines (cars & trucks) had mechanical (solid) lifters.

2. All 235/261 truck engines had mechanical (solid) lifters (see #3 for Powerglide 235 information).

3. 1950-1952 235 engines were used in Powerglide-equipped cars and they had hydraulic lifters.

4. 1953-1955 Corvette 235 engine: the Powerglide transmisssion was standard and the Corvette's Blue Flame Six used mechanical lifters (and it had a higher-lift cam that was used in the 261 truck engine).

5. 1953 was an odd/transition year for 235 engines.  In all earlier years, the 216/235 engines had low-pressure lubrication and they all had 15 head bolts and a 2-bolt valve cover.  In 1953, the Powerglide equipped cars (and Corvette) had high-pressure lubrication 235 engines with 18 head bolts (as used in all later 235/261 engines) and 2-bolt valve cover.  To add to this confusion, the 1953 truck 235 had 18 head bolts still had low-pressure lubrication and had the 2-bolt valve cover.

6. 1954 & 1955 Passenger cars with the high-pressure 235 and manual transmission continued to use mechanical lifters.

7. All 1956-1962 235 Passenger car engines used hydraulic lifters.

8. 235 engines were used in some Powerglide-equipped trucks (around 1960 and later) - hydraulic lifters were most likely used in those engines?

9. 1958-1962 235 and 261 truck engines used a solid (mechanical) lifter (tappet) that had an annulus around the lifter body for passage of oil to the rocker shaft assembly. Earlier mechanical tappets (lifters) should not be used in these engines (but hydraulic lifters could be used).


History of the Stovebolt 6 Engine

horsepower | casting codes | head-bolt patterns | side/valve covers

1954Advance-Design.com

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