SBC Domed Piston Set 4.060 Bore +8cc

The Wiseco-Pro Tru SBC Domed Piston Set 4.060 Bore +8cc (Part Number PTS502A6) is a precision forged piston kit engineered for small block Chevy engines requiring higher compression and pump gas capability. The 23-degree domed crown design delivers +8cc of additional displacement per piston, enabling builders to increase compression ratios without resorting to exotic fuel blends or costly cylinder head modifications. This piston set is ideal for street performance, bracket racing, and naturally aspirated engine builds where pump gas compatibility and reliable detonation control remain critical.

The 4.060-inch bore diameter accommodates standard small block Chevy block overbore tolerances, while the 1/16 x 1/16 x 3/16-inch ring groove configuration ensures proper ring seal and minimal blow-by across the RPM range. Wiseco-Pro Tru forging technology provides superior strength-to-weight ratios compared to hypereutectic casting, translating to reduced reciprocating mass and lower inertial stress during high-rpm operation. The domed piston crown geometry maximizes combustion chamber efficiency while maintaining flame-travel characteristics that support consistent ignition across load ranges—a fundamental requirement for pump gas engines operating at elevated compression.

This piston set suits engine builders and performance enthusiasts rebuilding or upgrading small block Chevy platforms for increased horsepower without sacrificing fuel availability or daily drivability. Street rodders, weekend racers, and vintage car restoration specialists rely on domed piston kits to achieve compression targets that gasoline-fueled carburetors and EFI systems can safely detonate. The PTS502A6 configuration fits directly into OEM-style blocks and pairs with standard small block Chevy connecting rods and crankshafts, simplifying installation and reducing build complexity.

Forged small block Chevy pistons represent a proven platform for performance builds spanning multiple decades. The domed design offers a well-established path to compression increase, making this piston set compatible with modern fuel octane ratings and ignition timing maps while delivering measurable power gains over factory flat-top configurations.