Chevy 350 Speed Pro Pistons Small Block Chevy Size: .40 BORE Rod Length : 5.7" Looking for a complete overhaul kit with gaskets, bearings, oil pump, etc? CLICK HERE! This is for a new set (8) of Speed Pro (FMP) Hypereutectic Chevy 350 pistons - H345DCP040. +40 bore. Flat top with 4 valve reliefs. Anti-friction coated skirts. For use with stock length 5.7" connecting rods (press fit only) (These can be used as a full floating piston you will need to buy the locks from Speed Pro. Includes pins.