SBF 351W D-Cup 2V Piston Set 4.030 Bore -19.5cc

The KB Performance Pistons SBF 351W D-Cup 2V Piston Set with 4.030 Bore and -19.5cc compression volume is engineered for Small Block Ford applications requiring precision hypereutectic pistons. This eight-piece set delivers the bore accuracy and ring groove geometry necessary for high-performance street and competition builds where cylinder head selection and compression ratio control are critical variables.

Hypereutectic piston construction offers superior durability and thermal stability compared to cast aluminum alternatives, making it suitable for both naturally aspirated and forced-induction Small Block Ford platforms. The -19.5cc dish volume accommodates flat-top or domed cylinder heads and pairs with 351W heads to achieve target compression ratios while maintaining valve clearance. Ring groove specifications—5/64 x 5/64 x 3/16 inches—follow OEM standards for reliable sealing and blowby control across the RPM range. The 4.030-inch bore size matches stroker and overbore builds where standard 4.000-inch pistons no longer fit.

This piston set is intended for engine builders, performance shops, and enthusiasts assembling or rebuilding Small Block Ford long-blocks where bore diameter and compression specifications are locked. The D-Cup dome design supports boost applications and high-RPM operation. Buyers should verify complete cylinder head, gasket surface, and deck height measurements before installation to confirm actual compression ratio and valve clearance compatibility.

KB Performance Pistons maintains a strong reputation in the high-performance engine rebuild market, with products widely used in drag racing, street performance, and marine applications. Proper ring end-gap setup, piston pin fit, and rod clearance verification during assembly are essential to ensure long service life and prevent premature wear or failure.