RWA1563 Keith Black hypereutectic pistons are made from 390 aluminum alloy and heat-treated to T6 standards, which makes them 30 percent stronger than ordinary untreated hypereutectics. Their 100 percent CNC-machined crowns, high upper compression-ring location, gas-accumulator groove, drilled oil returns, and spiral-lock retainer grooves make these pistons outstanding for performance applications. They have a lightweight, rigid-rib skirt design that stabilizes the piston in the bore. We have run these pistons in our own race engines with great success. These pistons are a great way to go if you are on a tight budget. We stock .030 and .040 over bores. STD and .020 bore are available as a special order.
- Bore 3.810″ (.030) 3.820″ (.040)
- Flat top with two valve reliefs
- Hypereutectic aluminum
- Compression Height 1.590″
- Full floating or Press fit pin
- .912″ pins (included)
- 1/16″ x 1/16″ x 3/16″ ring thickness