Chevy Six Cylinder Engine Identification

What is it?

The best way to ID a Chevy six cylinder engine is to use the casting numbers found on the block. There are, however, some other telltale signs to help you identify an engine at a glance.

The engine casting number can usually be found on the “passenger side” of the block, just above the starter. If you have the casting number from the side of the block, please try using ourĀ Six-Cylinder Engine Casting Number Lookup Tool.

Early Stovebolts

The Pre-1954 216 and 235 engines used babbit bearings and splash oiling, and many of these engines were replaced at some point with late-model engines, for better performance and reliability. These engines can be quickly identified by the following features:

  • Two studs holding down the valve cover
  • A tall side cover which the spark plugs pass through

Late Stovebolts

The Late (1954 – 62) 235’s and 261’s can be identified by:

  • Four screws holding down the valve coverĀ (“dummy” studs are sometimes seen on the valve covers)
  • A shorter side cover which stops below the spark plugs

Comments (3)

  1. Roeula

    4 years ago

    Is the head from a 1941 235 compatible with a 1955 block>?

    • Jonathan Groff (Admin)

      Jonathan Groff (Admin)

      4 years ago

      The early 235 has very little in common with the later more common 235. The head would not be interchangeable.

  2. Karl Williams

    4 years ago

    The engine in my 1953 Chevrolet 3600 truck is painted blue and the numbers on the pad beneath the distributor are F 02271 991MM. I cannot find this engine anywhere. I understand the F can mean Flint or a year, the 02271 is stamped differently than the stamp for the 991MM.
    Can you help?

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