These small block Chevy 350/400 inverted dome top pistons by srp are made from 4032 low-expansion, high-silicon aluminium alloy that's heat-treated to srp specifications. The ring Land and crown Thickness have been specifically engineered for mild turbo, Supercharged, and nitrous applications. Their forced pin oiler provides increased wrist pin lubrication. A pin fitting, double Spiro locks, and a wall wrist pin are included. The CNC-machined ring grooves accept 1/16, 1/16, 3/16 rings, which are sold separately.