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Old Nov 24, 2023 | 02:15 AM
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Default Bore/Piston

I've just stripped my LS2 and found the pistons have .50 stamped on them. From what i've looked up this seems to be .5mm/20thou over?

However when I measure the pistons(at there widest point they are 4.011" and the bore is 4.017").

I'm confused as expected the pistons to measure 4.020" and the bore to be around 4.025".

Any help appreciated as i'm trying to get some replacement pistons.

Thanks
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Old Nov 24, 2023 | 04:57 PM
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Bore should be measured with a dial-bore gauge for accuracy, from top to bottom…not only for sizing, but for taper also. Use a quality outside mic to measure piston at the skirt, about an inch up from the bottom, for proper sizing. Perhaps this is how you did these procedures? Welcome to LS1Tech!
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Old Nov 26, 2023 | 12:18 PM
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Thanks, that’s how I measured it, several times and got a consistent measurement.
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Old Nov 28, 2023 | 07:26 AM
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That doesn’t add up. Use a standard and see if your micrometer is calibrated.
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Old Nov 28, 2023 | 07:37 AM
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I double checked the measurements with different calibrated equipment and got consistent results. It just doesn’t make sense
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Old Nov 28, 2023 | 05:57 PM
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Pistons should measure really close to 4.0185 (depending on wear) if indeed .50mm.
Bore should be in the 4.020-4.021 range.
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