NEW: 9:1 Spec Pistons for IMCA & USRA Engines
JE Pistons has expanded its circle track product lineup with a purpose-built forged spec piston engineered specifically for 9:1 compression spec engines. Developed for competitive classes such as IMCA Modifieds, Sport Mods, and Hobby Stocks, this new design blends lightweight construction with JE’s decades of racing piston expertise to give racers a true edge in performance.
Spec engine racing demands strict adherence to rules—but it also rewards next-level products designed to make the most of the ruleset. JE’s new 9:1 piston features an -18.5cc dish, engineered to pair perfectly with GM’s 64cc chamber heads to produce an exact 9.0:1 compression ratio. Designed with the spec racing environment in mind, this piston delivers not only the right compression, but also optimized performance in restricted horsepower applications where every advantage you have over the competition counts.
Race-Proven Features, Track-Ready Performance
This piston is forged from JE’s high-strength 2618 aluminum alloy and designed using a lightweight forging that reduces rotating mass for quicker throttle response and improved acceleration out of corners. Internal strut lightening holes further reduce weight and help minimize windage losses inside the crankcase for an increase in effinency and horsepower.
Other performance-enhancing features include JE’s Dual Velocity Gas Ports, which maximize ring seal and combustion efficiency, resulting in measurable power gains across the RPM range. Additional refinements such as contact reduction grooves and an accumulator groove help minimize drag and stabilize the piston under load for improved reliability during extended race sessions.
Complete Spec Piston Kit, Made in the USA
Each piston set includes a premium ring pack featuring a .043” gas-nitrided steel top ring, .043” Napier-style second ring, and a 3mm oil ring—selected for their sealing properties and endurance under race conditions. The set also comes with 2.250” x .150” wall wrist pins, ready to handle the demands of high-RPM circle track use.
As with all JE Pistons products, these pistons are 100% made and machined in the USA, ensuring tight tolerances, exceptional quality control, and consistent race-ready performance.