SBC F/T Powerpak Piston Set 4.035 Bore -4.1cc

The MAHLE PISTONS SBC F/T Powerpak Piston Set with 4.035 bore and -4.1cc compression is a flat-top piston assembly engineered for small block Chevy stroker builds and high-compression race applications. This complete kit delivers precision-forged construction and optimized ring groove geometry designed to handle sustained high-RPM operation while maintaining reliable compression sealing and thermal stability across extended duty cycles.

Specification breakdown: the 4.035-inch bore accommodates standard small block Chevy block preparation and allows for greater displacement when paired with a stroker crankshaft. The -4.1cc compression cup reduces total chamber volume, increasing static compression ratio—critical for naturally aspirated engines seeking peak power output without sacrificing detonation margin. Ring groove architecture (1mm/1mm/2mm) follows industry standards for modern ring designs, ensuring consistent blowby control and minimal friction losses. The flat-top design provides maximum piston-to-valve clearance in aggressive cam applications and simplifies valve pocket machining during block preparation.

This piston set is built for engine builders and enthusiasts developing street/strip small block Chevy combinations where compression ratio optimization and displacement increases drive performance gains. Ideal for 383 and 406 cubic inch stroker builds, crate engine assembly, or racing engine rebuilds where OEM or near-OEM bore sizing is maintained but compression and displacement must increase. Serious builders select MAHLE for consistent wall thickness, superior material quality, and proven longevity under sustained boost or high-RPM load.