Engines and Components› Pistons and Piston Rings

JE Pistons

LS ASYM DM 4100STRKR

$226.10

SKU: J001 312130L

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Description

The JE Pistons 312130L is a set of LS asymmetrical FSR dome pistons designed for GM LSX LS7 engines. These pistons feature a 4.135-inch bore size, a 4.100-inch crankshaft stroke, and a 6.125-inch rod length. Constructed from 2618 forged aluminum, they are lightweight and durable.

The FSR (Forged Side Relief) forging design minimizes friction by using a larger skirt on the major thrust side and a smaller skirt on the minor thrust side. The pistons are machined for 1.2mm, 1.5mm, and 3.0mm rings and include accumulator grooves and double pin oilers.

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Specifications

BrandJE Pistons
Part NumberJ001 312130L

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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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