BARP maraging cylinder head stud kit for Renault F16

Subaru EJ25 / EJ257 pistons are developed for moderate to high-level preparation, primarily for street or club racing cars looking to build their engine for high mileage and/or street use. Designed by ZRP engineers and manufactured in Germany using 4032 (T6) high-silicon, low-expansion alloy. This allows the engine builder to run tighter piston-to-wall clearances, resulting in better sealing. This minimizes cold-start slap noise common in engines using forged pistons, providing quiet operation and low oil consumption. We have chosen a full-round skirt design with a bottom reinforcement band, featuring oversized and deeper valve pockets to allow for the use of high-lift camshaft profiles. They feature offset wrist pins for quiet operation, and the wrist pins are made of 9310 alloy. Other features include anti-detonation grooves to protect the top rings, a gas pressure accumulator groove for better ring sealing, and vibration relief. Premium Japanese-quality 1.00mm x 1.20mm x 2.80mm ring package included. Product features and design: Anti-detonation grooves for increased lifespan and performance. Gas pressure accumulator groove on the second ring land for increased lifespan. Horizontal slots in the pin bore designed to allow oil into the wrist pin area and pin bore. CNC precision-machined ring grooves. 4032-T6 high-silicon/low-expansion alloy. Honed pin bores. Lateral gas ports for better ring sealing. Full-round skirt design with bottom reinforcement band for high-power/forced induction applications. Valve pockets designed to allow for oversized valves and high-lift camshafts. Pistons designed to optimize compression for increased engine longevity and higher power potential. Optional coatings offered upon request: "Blast Off Bronze" thermal barrier coating; "Stealth Black" molybdenum side skirt and under-crown coating.