ARP 135-6002 High-Performance 8740 Complete Rod Bolt Kit (3/8")
Unquestionably the most important fasteners in any engine are the connecting rod bolts as they hold the key to the entire rotating assembly. A broken bolt will lead to catastrophic engine failure. As you can imagine the most critical joint is where the connecting rod halves mate. The rod bolts must support the primary tension loads caused by each rotation (or cycle) of the crankshaft. When the crank rotates the big end of the connecting rod essentially becomes oval-shaped and the rod bolts bend. As the crankshaft continues to rotate the rod becomes round again. With alternating tension loads and cyclic bending of the bolts it is very important to install fasteners that are able to exert a clamping force greater than the load imposed upon the joint (tension).

In addition to utilizing a rod bolt with sufficient strength to withstand the tremendous cyclical strains placed upon it it is absolutely imperative that the bolts be properly tightened. The preferred method of monitoring the correct amount of tension is through use of a stretch gauge. This is far more accurate than using a torque wrench. Moreover through subsequently checking the rod bolts length at teardowns it is possible to determine if it has been stressed beyond safe limits and must be replaced.

A premium grade 8740 alloy chrome moly steel is used to manufacture ARP High Performance connecting rod bolts. This material is heat-treated to provide a tensile strength in the 200 000 psi range which is substantially stronger than the bolts. Cycle testing shows ARP High Performance rod bolts to be nearly five times more reliable than stock bolts.

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History & Background on ARP They say that to be successful you must identify a need and satisfy it. Back in 1968 racing enthusiast Gary Holzapfel saw that many of his friends’ broken engines were caused by fastener failure. At the time there were no commercially available studs and bolts up to the challenge. So Holzapfel called upon his many years of fastener making experience for a leading aerospace subcontractor and founded ARP® (Automotive Racing Products). In the ensuing years the firm has grown from what was literally a backyard garage workshop into a highly diversified manufacturer with five operational entities in Southern California with a combined area in excess of 200 000 square feet. These include forging machining finishing and packaging/warehousing facilities in Santa Paula and Ventura California. There is even a unique racing-themed restaurant at the main Santa Paula facility - called “Hozy’s Grill” - which is open to the public. Today ARP’s product line contains thousands of part numbers and has expanded to include virtually every fastener found in an engine and driveline. These range from quality high performance replacement parts to exotic specialty hardware for Formula 1 IndyCar NASCAR and NHRA drag racing and marine applications.

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