Pont. 400 Dished Piston Set 4.150 Bore -17cc

The KB Performance Pontiac 400 Dished Piston Set 4.150 Bore -17cc represents a hypereutectic piston solution engineered for Pontiac V8 engine builds requiring compression and displacement optimization. This eight-piston set delivers the precision geometry and thermal stability demanded by both street and competition builds, with the -17 cubic centimeter dish cavity designed to lower compression ratios while maintaining structural integrity across extended operating ranges.

Each piston features a 4.150-inch bore diameter matched to the specified ring groove configuration (5/64 x 5/64 x 3/16 inch), ensuring optimal ring seating and blow-by control in higher-displacement Pontiac V8 applications. The hypereutectic alloy construction provides superior thermal conductivity and dimensional stability compared to cast aluminum, reducing expansion-related clearance issues during thermal cycling. The dished crown geometry accommodates forced-induction setups or pump fuel with lower octane ratings where compression reduction is critical for knock control. KB Performance's piston design integrates proven load distribution and pin boss reinforcement, translating to extended service life in street, strip, and marine duty cycles.

Serious Pontiac engine builders—whether restoring a classic Bonneville, building a 455 performance package, or tuning an existing 400 block—turn to KB Performance pistons when stock or near-stock geometry no longer meets compression and reliability requirements. This set is ideal for naturally aspirated upgrades, carburetor-to-EFI conversions, or transition builds where reducing compression ratio unlocks additional tuning headroom. Compatibility with original Pontiac rod and crankshaft packages simplifies installation into existing blocks, making this piston set a straightforward upgrade path for engine rebuilds and mid-life modifications.