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ARP 251-6402 ARP High Performance Series Wave-Loc Connecting Rod Bolts

ARP 251-6402 ARP High Performance Series Wave-Loc Connecting Rod Bolts

$67.25
$67.25
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The ARP 251-6402 ARP High Performance Series Wave-Loc Connecting Rod Bolts are high-strength connecting rods built for serious power. As the component linking piston to crankshaft, connecting rods must withstand extreme cyclic loads while maintaining dimensional stability at high RPM. These rods are engineered for performance street, strip, and race engines where failure is not an option.

Manufactured from premium 4340 forged steel, these connecting rods are CNC-machined and heat-treated for maximum fatigue resistance. The H-beam or I-beam design provides an excellent strength-to-weight ratio for engines seeing sustained high-RPM operation. Each rod is precision-bored to accept standard floating wrist pins and includes a bushed small end for reduced friction. ARP or Wave-Loc fasteners are installed at the factory with proper torque specifications for consistent clamp load. The big end bore is held to within +/-0.0002-inch for consistent bearing crush and oil clearance.

These rods are weigh-matched to within +/-1 gram per set, ensuring balanced rotating assembly operation. The beam design resists bending and fatigue in high-torque applications, making them suitable for naturally aspirated, nitrous, and forced induction combinations. Side clearance is machined to specification for adequate oil flow through the rod journals. The precision-machined big end accommodates standard rod bearings with widths matching your specific crankshaft journal configuration. Shot-peened surfaces provide additional fatigue resistance for high-RPM applications.

Whether you are assembling a 383 stroker, a 406 small block, or a big block build, these rods provide the foundation for reliable high-horsepower operation. The combination of premium 4340 material, precision manufacturing, and quality fasteners means you can set the timing curve and lean on the throttle with confidence. Add these ARP 251-6402 ARP High Performance Series Wave-Loc Connecting Rod Bolts to your rotating assembly today.
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Frequently Asked Questions

What length and beam design does this ARP High Performance Series offer for my engine?

These connecting rod bolts are available in lengths of 5.700, 5.850, 6.000, and 6.125 inches for small block and 6.385, 6.535, and 6.800 inches for big block applications. The H-beam design provides superior resistance to bending under high cylinder pressure compared to I-beam rods of the same weight. These connecting rods are forged from 4340 chromoly steel and rated for up to 800 horsepower in naturally aspirated builds and 1,000 horsepower with nitrous or forced induction. Each rod is weight-matched within 2 grams per set with 7/16-inch ARP 8740 fasteners torqued to 75 to 80 foot-pounds.

How do these ARP High Performance Series handle horsepower levels above 700 in a stroker build?

These connecting rod bolts withstand 700 to 1,000 horsepower in 383 and 427 stroker builds thanks to 4340 chromoly steel heat-treated to 180,000 to 200,000 PSI tensile strength. The 7/16-inch ARP 2000 bolts provide 175,000 PSI clamp load at the rod cap interface, preventing cap shift at cylinder pressures exceeding 1,200 PSI. With these connecting rods, rod bolt stretch should measure 0.0055 to 0.0065 inch for proper clamp load verification with a stretch gauge. For forced induction above 15 PSI, upgrade to ARP 625 bolts and reduce the oil change interval to 3,000 miles.

Can these ARP High Performance Series be used with a factory stroke crankshaft without clearance issues?

Yes, these connecting rod bolts work with factory 3.48 inch and 3.75 inch stroke crankshafts but require checking rod-to-camshaft clearance with a minimum of 0.050 inch at the closest point. The rod beam width measures 0.800 to 0.900 inch at the narrowest point, clearing most factory block web areas in 350 and 400 cubic inch platforms. For 383 stroker builds using these rods with 5.7 or 6.0 inch length, clearancing of the block's lower cylinder bores may be needed for bolt clearance. Always grind rod bolts for additional clearance if necessary, maintaining at least 0.060 inch between.

What piston pin options fit these ARP High Performance Series for a 350 or 383 build?

These connecting rod bolts accept 0.927 inch or 0.937 inch floating piston pins depending on the specific part number ordered. The small end of these rods features a precision bronze bushing honed to 0.0008 to 0.0012 inch pin clearance for proper lubrication at 6,000 to 7,500 RPM. For 383 builds, use a 6.000 inch rod with a 1.425 inch compression height piston for proper deck height and zero deck clearance. Full-floating pins with spiral locks or double Tru-Arc clips are recommended to prevent pin walk at high RPM exceeding 6,500.

What is the proper bearing clearance for these ARP High Performance Series on the crankshaft journal?

Proper bearing-to-journal clearance for these connecting rod bolts should measure 0.0020 to 0.0028 inch for street performance and 0.0028 to 0.0035 inch for racing applications using Clevite H-series or King XP bearings. Rod big end bore diameter is precision-machined to 2.100 or 2.250 inches depending on journal size, with a surface finish of 10 to 15 micro-inches for proper oil film retention. Oil clearance should be verified using Plastigage at 0.0022 inch minimum at cold assembly. Running clearance increases by approximately 0.0003 to 0.0005 inch at 200 degrees Fahrenheit operating temperature on a 2.100 inch journal.

Does this ARP High Performance Series require balancing with a new harmonic balancer and flexplate?

These connecting rod bolts require the entire rotating assembly to be precision-balanced if replacing factory rods due to weight differences typically exceeding 20 to 30 grams per rod versus OEM. For externally balanced engines, the 400 small block requires a neutral balance damper with a weighted flexplate at 2.4 or 7.0 ounce-inch depending on the application. These connecting rods are balanced internally for the weight of the pistons, pins, rings, and bearings at 50 percent of the reciprocating mass. Always provide your damper and flexplate to the balancing shop for proper dynamic balancing within 0.5 inch-ounce tolerance.