Engines and Components› Pistons and Piston Rings

JE Pistons

LS ASYM DM 4100STRKR

$226.10

SKU: J001 312121R

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Description

The JE Pistons 312121R is a set of forged pistons designed for GM LS engines. These pistons feature an asymmetrical Forged Side Relief (FSR) design, which provides increased strength on the major thrust side while reducing friction on the minor thrust side for a lightweight yet durable component. They are machined for 1.2mm, 1.5mm, and 3.0mm rings and include accumulator grooves, double pin oilers, and an offset wrist pin.

Fitment

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Specifications

BrandJE Pistons
Part NumberJ001 312121R

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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