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Cylinder block numbers question

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  • Engine: Cylinder block numbers question

    Each of my cylinder bores has a number stamped by it. 3, 35 or 4. What are these numbers?

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    The one the right is a 4.
    Thanks,
    Mike
    Mike and Dawn

    '61 Champ

  • #2
    One explanation I've heard is machining wasn't nearly as accurate then, so after final honing, each cylinder bore diameter was ascertained and stamped with a code. Then, pistons were measured and put into correspondingly marked bins. The engine assembler would read the code on the cylinder and select a matching piston. The idea was this would insure six slightly different cylinders all ended up with pistons which fitted with the proper clearance.

    Anyone have another explanation?

    jack vines
    PackardV8

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    • #3
      That's fully explained in every shop manual. As Jack says it's to allow selective piston fit during original assembly at the factory. After 5,000 miles or so those numbers no longer have any meaning at all.

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      • #4
        Originally posted by PackardV8 View Post
        One explanation I've heard is machining wasn't nearly as accurate then, so after final honing, each cylinder bore diameter was ascertained and stamped with a code.
        Thanks for the information.

        Mike and Dawn

        '61 Champ

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        • #5
          Originally posted by Dwain G. View Post
          That's fully explained in every shop manual. As Jack says it's to allow selective piston fit during original assembly at the factory. After 5,000 miles or so those numbers no longer have any meaning at all.
          Thanks. My other Studebaker block does not have those numbers stamped in the block. Maybe a later engine. Interesting though, thanks again.
          Mike and Dawn

          '61 Champ

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          • #6
            I was told that around the late 90's - early 2000's , GM engines (350 +) could developed "piston slap" due to worn engine block molds ??? A further conversation led to the "select fit" piston discussion and how technology had surpassed this procedure... Anyone care to discuss more (Not facts, just hearsay)....

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