ARP 300-6704 Custom Age 625+ Rod Bolt Kit – 3/8in – 8 Piece Set

Upgrade your engine hardware with the ARP 300-6704 Custom Age 625+ replacement rod bolt kit. Designed as a general replacement rod bolt kit, this 8-piece set is built for high-performance engine applications where stronger connecting rod fasteners are required.

ARP Custom Age 625+ material is engineered for extreme strength and durability, making it a strong choice for high-revving all-motor, turbocharged, supercharged, nitrous, and competition engine builds. ARP lists this material with a tensile strength of 260,000 psi, offering a major strength upgrade over many standard replacement rod bolts.

This kit includes 3/8-inch rod bolts with a 1.500-inch under-head length and 7/16-inch 12-point socket size. Because this is a general replacement rod bolt kit, always verify the bolt dimensions against your connecting rods before ordering.

Features

• Genuine ARP replacement rod bolt kit

• Part number: 300-6704

• Custom Age 625+ material

• 260,000 psi tensile strength

• 8-piece rod bolt set

• Thread size: 3/8 in

• Under-head length: 1.500 in

• Thread length: 0.550 in

• Grip length: 0.145 in

• Head height: 0.388 in

• Socket size: 7/16 in 12-point

• Collar diameter: 0.555 in

• Designed for high-performance engine builds

• Suitable for all-motor, forced induction, high-RPM, and racing applications when dimensions are correct

Important Fitment Note

This is a general replacement rod bolt kit. Confirm thread size, under-head length, thread length, grip length, head style, collar diameter, connecting rod design, and required torque/stretch procedure before ordering.

Do not purchase by vehicle fitment alone. Match the ARP dimensions to your existing connecting rod hardware or confirm compatibility with your engine builder.

What’s Included

• 8 ARP Custom Age 625+ replacement rod bolts

• ARP part number: 300-6704