Home: Tim's Trucks || 1954 Documents
Engine Casting Codes & Serial Numbers
1951 Chevrolet 235 low-pressure inline 6 cylinder engine
NOTE: these photos are from a 1951 235 engine from a 6000 series truck.
Other other low-pressure (babbetted rod bearings) codes should be in the same locations shown below.
The photod below were kindly provided by Mike Reese.
block codes
engine serial number
block casting code
block date code (date-casting code)
PHOTO 1: block casting code
between and below the distributor hole (left-top) and road-draft-tube hole (right-top)
3692703 (1950-51 235)
PHOTO 2: block date-casting code
lower left on the distributor side of the block (note the "captain's bars")
J 11 1
letter = month = J = 10 = October
number = day = 11th day of the month
number = year = 1 = 1951
October, 11 1951
(CON3 is to the left of the date code)
PHOTO 3: engine serial number
on the ledge to the left of where the distributor enters the block
JEAI 107679
J = model year = 1951
EA = type designation = 6000 series 235.5 engine
I = ???
107678 = 106638th truck off that assembly line in 1951
1951 235 engine in a 6000 series truck
PHOTO 5: head codes on manifolds' side - see next two photos, below
head casting code on left & head date-casting code in front of valve springs on the right
PHOTO 6: head casting code
top, middle of the manifolds' side of the head
3835499 (1950-52 235)
(CON 12 is another casting under the valve cover and GM 6 is under the head casting coode)
PHOTO 7: head date-casting code
on the top of the head, under the valve cover, between the 4th and 5th cylinders' valves
J 12 1
letter = month = J = 10 =October
number = day = 12th day of the month
number = year = 1 = 1951
October 12, 1951
PHOTO 4: ??? - B 61 - 848 850 - ???
How are these decoded ??? All heads I have seen start with the "B"
on the head, between spark plus 2 & 3
(note the threaded plug at the upper-left, in front of the internal oil-journal to the rocker arm assembky)
For more information abour casting codes,
check out this web page by Bob Adler
Home: Tim's Trucks || 1954 Documents