This listing is for a set of eight 8 +.030 over size or 4.030" Bore Diameter 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 1967-85 passenger cars and 1969-85 LD trucks; except H/P and special models. Piston specifications are as follows: Bore: 4.030" Bore Diameter. 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 Diameter: .928". Press-fit pins.