This listing is for a set of eight (8) STANDARD bore Sealed Power cast aluminum flat top 4VR pistons and a cast piston ring set compatible replacements for 1967-85 Chevrolet 350 5.7L V-8 Car & Truck engines. These are stock replacement pistons for 1967-70 passenger cars and 1969-70 LD trucks; except H/P and special models. Piston specifications are as follows: Bore: 4.000" at Standard size. Head Type: Flat head w/4-valve reliefs. Comp. Ratio 8.7:1. Ring Lands: 5/64"-5/64"-3/16" Comp.. Distance: 1.540". Pin Diamter: .928". Press-fit pins.