If you have aftermarket pistons and connecting rods with ARP 2000 bolts and want to increase your engine's power capacity, this is the best way to do it. Most aftermarket manufacturers of connecting rods have one set of rods good up to about 600 horsepower with ARP 2000 bolts. They will also offer the same rods with ARP 625 bolts with an 800-900+hp holding capacity. By replacing the rod bolts with these ARP 625 bolts, you can significantly strengthen the connecting rod.

CUSTOM AGE 625 PLUS: This newly formulated super-alloy demonstrates superior fatigue cycle life, tensile strength and toughness - with complete resistance to atmospheric corrosion and oxidation. ARP is the first to develop manufacturing and testing processes for fasteners with Custom Age 625+. Typical tensile strength is 260,000-280,000 psi.

Size 3/8 x 1.6, 3/8 head size.

Almost every aftermarket rod we have ever come across uses ARP 3/8 bolts, so you should be good if you have a Neon, Neon SRT-4, PT Cruiser Turbo, or Caliber SRT-4, but please double check on your own to make sure your specific connecting rods use a 3/8 bolt.