This Isn’t a Hardware Store Bolt. This is an ARP.

Let’s be clear. You’re building or rebuilding a Chevy big block. That’s not a hobby, it’s a commitment. The stock head bolts from the factory did the job, but you’re here because “did the job” isn’t good enough. You need clamping force that doesn’t quit. You need a seal that holds under boost, nitrous, or just plain high compression. You need the ARP 135-3603 head bolt kit.

These aren’t just replacements. They’re upgrades. When you torque these down, you know the heads aren’t going anywhere. That’s peace of mind you can’t get from a factory-style bolt.

What You’re Getting in the Box

The ARP 135-3603 kit is complete. You get twenty (20) head bolts in the correct lengths for your Chevy Mark IV big block application. They’re made from ARP’s proprietary 8740 chromoly steel, heat-treated to deliver a consistent 190,000 psi tensile strength. Every single time.

The black oxide finish isn’t just for looks. It provides a layer of corrosion resistance and reduces galling during installation. These are ready to go right out of the box. No chasing threads, no guessing games.

Fitment is specific: This kit is engineered for Chevy big block engines with standard deck height and standard (non-12-point) head bolt holes. Covers the popular ranges: 396, 402, 427, and 454 cubic inches.

Why ARP is the Only Name That Matters

ARP didn’t get into fasteners by accident. They started because racers kept breaking everything else. So they built their own. Today, they’re the standard because their process is obsessive.

They start with the right alloy. They roll the threads after heat-treatment (that’s key for strength). They test every batch. They’re so precise that aerospace companies (AS9100) and high-tech manufacturers (ISO 9001) use them for critical applications. If it’s good enough to hold a jet engine together, it’s good enough for your 454.

When you buy ARP, you’re buying a known quantity. The bolt you get today is identical to the bolt you bought ten years ago. That consistency wins races and builds engines that last.

Who Needs These Bolts?

• The Builder Doing it Right: You’re assembling a performance street engine. You’re not cutting corners. Using ARP head bolts is a fundamental step in a reliable build.
• The High-Output Engine Owner: Running forced induction, spray, or a stout cam? Increased cylinder pressure demands a fastener that won’t stretch. This is cheap insurance.
• The Restorer Seeking Reliability: Even if you’re not chasing horsepower, old factory bolts can fatigue. Installing new ARP bolts ensures your freshly rebuilt big block stays sealed for the long haul.
• The Mechanic Who Hates Comebacks: You install these once. You don’t worry about seepage, leaks, or head gasket failure down the road. Your customer stays happy.

Technical Details & Installation Notes

Material: 8740 Chromoly Steel, Heat-Treated
Tensile Strength: 190,000 psi
Finish: Black Oxide
Thread: 1/2″-13
Kit Includes: 20 Bolts, necessary washers
Wrench Type: Standard Hex

Important: Always follow a reputable torque sequence and specification for your specific head gasket and application. ARP recommends lubricating the bolt threads and washers with their proprietary ARP Ultra-Torque fastener lubricant (sold separately) to achieve accurate, consistent clamp load. Do not use engine oil or other lubricants as they produce inconsistent friction and can lead to under or over-torquing.

The Bottom Line

For $135.11, you are buying the definitive solution for clamping your Chevy big block’s cylinder heads. This is not an area for compromise. A failed head gasket or, worse, a warped head costs far more in time, money, and frustration than this set of bolts.

At AutopartsSupplyUSA, we stock the ARP 135-3603 because it works. We use them in our own projects. When you order from us, you get the genuine part, shipped fast, with no nonsense. Add it to your cart, bolt it in, and build with confidence.

Part Number: ARP 135-3603
Price: $135.11
In Stock. Ready to Ship.