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ARP Bolts ARP Custom Age 625+ Carillo Connecting Rod Replacement 5/16 in. 12-Point - 300-6708

Alright, let’s talk about the Carrillo Connecting Rods—specifically the 300-6708 ARP Custom Age 625+ model. If you’re knee-deep in building a high-performance engine, you know how crucial connecting rods are. These bad boys are designed to handle serious power and torque without breaking a sweat.

First off, the cap screw retention style ensures that everything stays locked down tight, even when you’re pushing your engine to the limits. The rod bolt head style is an E-type, which means you’ll have an easier time getting a wrench on it. Speaking of wrenches, you’ll need a 7/16 inch wrench to get these bolts snugged up just right.

Now, let’s get into the nitty-gritty. The fastener yield strength is rated at a whopping 260,000 psi. That’s some serious strength right there, making these rods ideal for high-revving builds. The thread size is a standard 5/16 inch, and the connecting rod bolt diameter matches that as well, so you won’t have to worry about compatibility issues.

One thing to note is that these rods don’t come with nuts included, so make sure you grab those separately. And while we’re at it, the underhead length is 1.500 inches, which is pretty standard but worth mentioning if you’re fitting these into a specific setup.

What really sets these apart is the material. The ARP Custom Age 625 Plus is a game-changer. It’s designed to withstand extreme conditions, making it a go-to for serious racers and builders alike. If you’re looking to push your engine without the fear of rod failure, you’re in the right place.

So, if you’re building something that needs to handle the heat—like a turbocharged beast or a high-compression monster—these Carrillo rods are a solid choice. They’ve got the strength, the reliability, and they’ll keep your engine running smooth when the going gets tough.

Other Part Numbers:
ARP Bolts #arp300-6708

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The Story Behind ARP Bolts

ARP (Automotive Racing Products) was founded by Gary Holzapfel in 1968 when he noticed his drag-racing friends succumbing to bolt-induced engine failure as a result of poor-quality fasteners. He drew upon his expertise in the aerospace industry to develop a solution, which turned into a successful business nonetheless. 

Since its inception, ARP has been engineering and perfecting a wide range of bolts, studs, nuts, and other fasteners for engines, cylinder heads, headers, wheels, and transmissions. Today, ARP remains the undisputed world leader in automotive fasteners. Racing aficionados everywhere know and recognize the ARP brand and can vouch for its quality.

What Makes ARP Bolts So Special?

Located in Ventura, California, all ARP processes from raw wire to finished fasteners are conducted in-house, right here in the USA. The company continually improves its processes with strict quality control guidelines and is dedicated to producing products that are second to none. Simply put, ARP Bolts are better than the competition because of their quality materials and advanced processes. 

ARP prides itself on using only top-quality materials that are above the usual “aerospace-grade” quality that other manufacturers settle for. For example, while 8740 Chromoly steel has four different grades, ARP only uses the top two, SDF and CHQ. These grades cost twice as much as the lower commercial and aircraft grades, but deliver “zero defect” quality that you can trust each and every time.

ARP Bolts are built to withstand serious racing, possess greater tensile strengths, and can survive higher stress levels than most aircraft fasteners. ARP is dedicated to creating fasteners that boast ultimate strength and durability to ensure they last race after race. Its product lineup ranges from quality high-performance OEM parts to exotic specialty hardware for IndyCar, NASCAR, NHRA drag racing, Formula 1, and even marine applications.

Equip Your Ride with ARP Bolts at Vivid Racing

If you are looking to change the fasteners on your car, you’ve come to the right place. No other brand beats out ARP Bolts in terms of strength, quality, and race-proven success. Vivid Racing is, therefore, proud to carry an extensive lineup of products from American Racing Products like bolts, fluids, sealants, hand tools, stud kits, piston sleeves, wheel bolts, and more! If you have any questions regarding the parts above, please call our specialized sales team at (480) 966-3040.

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