Piston Ring Set - SBC 4.000 Bore 2.0 1.5 4.0mm

The Chevrolet Performance Piston Ring Set for SBC 4.000 Bore (2.0 x 1.5 x 4.0mm) is a factory-engineered component designed for small-block Chevrolet engines requiring precision ring replacement. This eight-cylinder piston ring kit delivers the exact bore sizing and low-tension ring design that maintains proper compression sealing while minimizing friction losses—critical factors for both stock rebuilds and performance engine work where ring gap and thickness tolerances directly affect blow-by rates and oil consumption.

The 4.000-inch bore specification targets engines bored to that diameter, while the 2.0mm top ring, 1.5mm second ring, and 4.0mm oil ring thickness are sized to work within the specific piston grooves of compatible small-block castings. Low-tension ring design reduces drag on the crankshaft and piston assembly, allowing the engine to breathe more freely at high RPM while maintaining adequate sealing for compression retention. Proper ring end gap clearance—critical when rings are fitted to their intended bore size—prevents ring sticking and ensures longevity under thermal cycling.

This OEM Chevrolet Performance ring set is engineered for owners rebuilding small-block engines, whether for street applications, light performance tuning, or restoration work. Correct ring selection is non-negotiable: oversized or undersized rings introduce excessive gap wear, poor sealing, and elevated oil burn-off. The 4.000-inch bore designation is precise—verify your engine's current bore size before ordering to ensure compatibility with your piston set and cylinder block.

Small-block Chevrolet engines remain the most commonly rebuilt platform in the hot rod, marine, and light-duty truck markets. Factory-spec ring kits like this maintain the integrity of that lineage, ensuring that rebuilt cores perform as originally designed. When sourcing piston rings for a bore-sized block, matching the OEM part number eliminates guesswork and aligns with the engine builder's original blueprint.

TacticalSurplusUSA stocks genuine Chevrolet Performance components for builders and enthusiasts who prioritize correct specifications and verified fitment over cost-cutting compromises.