ROSS Racing Pistons for the Modular and Coyote based engines are manufactured on advanced 2618-t6 forgings. Most feature double spiral locks (or wire locks in some applications), forced pin oilers with oil distribution grooves, and lock removal indentations. They also feature gas accumulator grooves in the second land, as well as optional gas ports.
Flat top pistons in a Ford Modular engine will generally provide compression ratios in the 10.75:1 range which makes them a good option for engines with aluminum heads and larger than stock camshafts. Valve reliefs are configured to work with most types of standard and aluminum cylinder heads and will normally fit most performance camshafts
Dish top pistons in a Ford Modular engine will generally provide compression ratios in the 8.5 to 10.0:1 range which makes them a good option for engines with aluminum heads and larger than stock camshafts, as well as forced induction applications. Valve reliefs (if required) are configured to work with most types of standard and aluminum cylinder heads and will normally fit most performance camshafts.
Dome top pistons in a Ford Coyote engine will provide compression ratios of 11.0:1, which makes them a good option for engines with aluminum heads and larger than stock camshafts, as well as forced induction applications. Valve reliefs (if required) are configured to work with most types of standard and aluminum cylinder heads and will normally fit most performance camshafts.
