JE Pistons LS ASYM FSR DISH/INV DM 4.075in Bore -19.6 Dome Set of 8 Pistons

If you're building a high-performance LS engine for racing or serious street use, you need pistons that can handle the stress. This set of eight JE Pistons is forged from 2618 aluminum, a material known for its high tensile strength, making it well-suited for demanding performance applications where durability is key. These pistons are designed specifically for LS engines and feature JE's proprietary Forged Side Relief (FSR) forging design. This design helps minimize friction and power loss by reducing skirt width, and further saves weight with a shorter wrist pin.

Beyond the FSR design, these pistons incorporate an inverted dome shape with a -19.6cc volume, which is crucial for achieving specific compression ratios when paired with your cylinder heads and block. The 4.075-inch bore size is a common upgrade for LS engines, allowing for increased displacement. JE Pistons also includes features like an accumulator groove, depending on the specific application, to help reduce combustion gas pressure, which in turn reduces ring flutter and improves ring seal for consistent power delivery. Some applications may also feature a skirt coating to reduce friction and noise, while also minimizing wear on the piston skirts and cylinder walls.

Every part of this piston set is manufactured 100% in the USA, from the initial forging to the final machining. This ensures a high level of quality control and supports domestic manufacturing. When building a powerful LS engine, using well-built, application-specific forged pistons like these from JE Pistons is a critical step toward achieving reliable performance and longevity.