Home: Tim's Trucks || 1954 Documents

Engine Casting Codes & Serial Numbers
1954-1963 Chevrolet 235/261 inline 6 cylinder

(NOTE: these photos are from a 1960 261 engine; however, 1954-63 235 & 261 codes should be in the locations shown below)

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PHOTO 1: block casting code
3769717

between and below the distributor hole (left-top) and road-draft-tube hole (right-top)

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PHOTO 2: block date-casting code
I 29 9
letter = month; number = day; number = year
September, 29 1959
(CON 4 is to the left of the date code)

lower left on the distributor side of the block
(note the "captain's bars" - all USA 261 blocks and 1953 passenger car Powerglide-equipped 235 blocks have these bars )

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PHOTO 3: engine serial number
F0930LB

on the ledge to the left of where the distributor enters the block

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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

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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

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PHOTO 6: head casting code
3836850
(CON 12 is another casting under the valve cover and GM 5 is under the head casting coode)

top, middle of the manifolds' side of the head

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PHOTO 7: head date-casting code
L 17 9
letter = month; number = day; number = year
December 17, 1959

check out this web page by Bob Adler

on the top of the head, under the valve cover, between the 4th and 5th cylinders' valves

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