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Hypereutectic LS3 Piston weight

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Old Mar 18, 2025 | 03:40 PM
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Default Hypereutectic LS3 Piston weight

Anyone have any weights for these? https://www.summitracing.com/parts/u...make/chevrolet
Engine is only destined for N/A cruiser, so forged would be overkill.
My Target is 493g (piston) if that helps, perhaps MAHLE / CLEVITE if anyone has those weight instead.

EDIT- Answered my own question as such, but data for anyone else that is searching
SILV-O-LITE 3530HCA .25mm Piston & pin = ~640g ( only seen 2G variation over the 8) PISTON = 490g // pin 150g

As a side note, the OE GM LS3 piston 494.5g // pin 145.5g




Last edited by Not_usually_UK; Mar 21, 2025 at 08:35 AM. Reason: Added measured Weight of 3530HCA 0.25mm
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Old Mar 18, 2025 | 10:43 PM
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Maybe @Summitracing might be able to look deeper into this?

If any of the builders on here might have used these and saved the info you might also get lucky.
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Old Mar 19, 2025 | 04:41 AM
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Originally Posted by 1FastBrick
Maybe @Summitracing might be able to look deeper into this?

If any of the builders on here might have used these and saved the info you might also get lucky.
yeah was hoping to get lucky from previous build. Ofc they are never always the same, but from sec sets I have used, they only vary a few grams.
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Old Mar 19, 2025 | 11:05 AM
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Thanks for tagging us in this @1FastBrick!

OP,

UEM doesn't provide the weight for the UEM-3530HCA-25MM pistons. We’ve reached out to them on your behalf to get this information. We'll update you as soon as we hear back.
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Old Mar 19, 2025 | 11:41 AM
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Originally Posted by Summitracing
Thanks for tagging us in this @1FastBrick!

OP,

UEM doesn't provide the weight for the UEM-3530HCA-25MM pistons. We’ve reached out to them on your behalf to get this information. We'll update you as soon as we hear back.
thanks 🙌
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Old Mar 21, 2025 | 09:00 AM
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Updated OP with what I had measured
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Old Mar 21, 2025 | 11:19 AM
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Originally Posted by Not_usually_UK
Anyone have any weights for these? https://www.summitracing.com/parts/u...make/chevrolet
Engine is only destined for N/A cruiser, so forged would be overkill.
My Target is 493g (piston) if that helps, perhaps MAHLE / CLEVITE if anyone has those weight instead.

EDIT- Answered my own question as such, but data for anyone else that is searching
SILV-O-LITE 3530HCA .25mm Piston & pin = ~640g ( only seen 2G variation over the 8) PISTON = 490g // pin 150g

As a side note, the OE GM LS3 piston 494.5g // pin 145.5g


Originally Posted by Not_usually_UK
Updated OP with what I had measured
Just circling back to update. We heard back from UEM regarding the UEM-3530HCA-25MM pistons and saw your updated post. We figured this would be relevant to share.UEM confirmed that with pistons like these, the weight can vary slightly from batch to batch. Their current inventory comes in at 492 grams, which lines up pretty well with yours weighing in at 490 grams. That variance seems well within expectations for this type of piston.

Hope that helps anyone else looking at these pistons or doing similar planning!

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Old Mar 21, 2025 | 11:58 AM
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Excellent info @Summitracing , it certainly ties up nicely with what I have found and definitely gives a ball park for users. Cheers.
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