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Old 07-19-2011, 11:52 AM
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Pontiac 400 ci piston question

Took the heads off my 400ci pontiac last week and found the pistons to look like this....






They are have a groove in the crown on the right side only, and also a small hole in the centre. What is the point in these features?

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Old 07-19-2011, 01:02 PM
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The groove is the direction indicator. They point to the front of the engine.
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Old 07-19-2011, 01:09 PM
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Hi
Those pistons are stock or builder pistons. The notch is for pointing the piston to the front of the engine.
Rich
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Old 07-19-2011, 01:42 PM
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The pistons are likely OEM, I don't recall aftermarket pistons using the beveled edge around the circumference that the factory pistons sometimes have.

AFAIK the center hole is a "locator" for tooling used during the machining of the pistons. Pretty, right?

The piston shown below also has the center "locator"- it's a stock OEM FT from a 350 Pontiac.

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Old 07-19-2011, 01:51 PM
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ok well that would make sense. Thanks guys
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