High performance Chrome Moly ball to ball type "B" engine pushrods. Made from aircraft quality 4130 alloy 5/16" seamless tubing with a .065 wall thickness, these are Nitrocarborized (heat treated) for strength and wear resistance, which can be noted by the black finish. These come in factory "B" (361/383/400) engine lengths of 8.555" long. Great for larger cams & performance applications. This part number is SOLD AS ONE SINGLE PUSHROD for service replacement or checking purposes.