Size: Box 1 Dims (LxWxH-W): 11 x 10.5 x 3.5 - 6PRODUCT DETAILS :PartNumber: wisK553M84 Description: Pro Tru Pistons; Sport Compact Series; Set of 4 Pistons; Recommended RingSet: 8400XX; Rings & Pins Included Gram Weight: 309 Stroke: 85 Comp Height: 30.5PRODUCT OVERVIEW: World renowned for our work building race winning pistons, Wiseco utilizes experience from a diverse background of the most sophisticated sport compact engines.Wisecos Sport Compact Pro Tru line creates the best value in forged pistons today. These American made pistons are forged and machined by skilled Ohio craftsmen with state-of-the-art forging presses and CNC machines. By using dedicated forgings specific to the final piston shape, Pro Tru pistons are stronger and lighter than industry standards.Pro Tru sets include plasma moly 1/16, 1/16, 3/16 pre-gapped ring packages which provide excellent seal, friction reduction, and long life. Pro Tru pistons also come in a variety of volumes that allow the engine builder to choose the exact compression ratio required for their engine.VEHICLE FITMENT: 1999 Mazda Miata 10th Anniversary L4.1839cc Engine::Cylinder Block Components 1999: 16Valve; w/ 207mm Deck & Different Valve Angles2000-2005 Mazda Miata LS L4.1839cc Engine::Cylinder Block Components 2000: 16Valve; w/ 207mm Deck & Different Valve Angles 2001: 16Valve; w/ 207mm Deck & Different Valve Angles 2002: 16Valve; w/ 207mm Deck & Different Valve Angles 2003: 16Valve; w/ 207mm Deck & Different Valve Angles 2004: 16Valve; w/ 207mm Deck & Different Valve Angles 2005: 16Valve; w/ 207mm Deck & Different Valve Angles