Chevrolet 235 Engine Serial Number

Feb 04, 2010  It is a smalll amost triangular metal cover screwed to the driver side of the block just above the pan flange and under the manifolds. If you find this then you are dealing with a pre 1953 low pressure 235 engine. Give us a serial number and possibly we can id the engine.

The Casting Numbers to the right are found just below and to the right of the Distributor on the passenger side. They are notoriously very hard to read and often people make the mistake of thinking a '3' is an '8'. Clean the area thoroughly and use a nice bright flashlight. This is usually a 7 digit number and each letter/number is about 1/2' tall. A little engine degreaser and a wire brush often makes this job easier.

 

The next numbers we need are the ones just below the Starter on the passenger side. This one will have a CONveyor Number and beside that a usually four digit letter/number combination separated like this: X XX X. For example, the first X will be a Letter from A through L. A = January through L = December. The center two digits are the day of the month. The final digit is the year the engine was made WITHIN the years that you narrowed it down to when you deciphered the Casting Numbers to the right.

 

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. All 235/261 truck engines had mechanical (solid) lifters (see #3 for Powerglide 235 information). Oct 15, 2010  I have a 1953 3600, but it does not have the original 216ci engine. Rather, the engine is a 235ci. The most I've been able to determine is that the engine is a standard 235 model and was made on Feb. 6th, between 1957 and 1962. Apparently, from 1957 on forward, chevy 235ci engines stopped using serial numbers.

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The next set of numbers you will find helpful are on the flat part of the Distributor Deck. This machined flat area has serial numbers stamped into it. If you have looked very carefully and find no numbers there, chances are your block is classified as a Replacement Block and will have no numbers stamped on that deck. The numbers you are looking for are stamped (about 1/4' high) and usually a Letter followed by three Numbers and ending in another Letter (or two). The first letter is almost always F since most GM engines were made in Flint, Michigan. The following numbers are the month first followed by the day of the month. The trailing letters denote what the engine was installed in. The possible Letters for the last ones are explained in the chart below.

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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)

PHOTO 1: block casting code
3769717

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

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 )

PHOTO 3: engine serial number
F0930LB

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

PHOTO 4: ??? - B 61 - 848 850 - ???

Small Block Chevy Engine Block Casting And Code Identification

How are these decoded ??? All heads I have seen start with the 'B'

on the head, between spark plus 2 & 3

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
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

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

Chevrolet Serial Number Identification

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

General Motors Corporation

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