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Old 10-10-2010, 04:51 AM
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Is this GM SBC 350 piston a std seize?

Hi cleaning up my engine to identfy parts for rebuild.

My cylinder 1 pistons shows 10046106 in the casting.
A.1 4 is stamped on top and a J on the bottom.

What do I have here?

See pictures.
Thanks
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Old 10-10-2010, 06:24 AM
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Blocks are measured for bore (+ or - ) size after leaving the final hone. A number/letter is stamped on the oil pan rail for the size of each cyl. bore.
As the engine block moves down the assembly line. The production sees a number/letter stamped on the oil pan rail. A "J" hole gets a "J" piston ring and rod assembly. An "H" gets an "H" etc.

An "A" piston being smaller than a "J" piston. "H" is the most common. All are considered "standard size"
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Old 10-10-2010, 12:44 PM
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Thanks
Bobcrman

it seems like GM Manufacture Engineering has using a wide band tolerances.

Very unusual that they could not control the bore dimensions.


BR
Bob
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Old 10-10-2010, 02:20 PM
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Thanks for the cool info Bob. I always was curious on why they stamped letters on the oil pan rail.
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