4140 Billet Main Caps for 5.7/6.1/6.2/6.4L HEMI 000-G3HKIT By Callies

Let’s face it—your Gen 3 HEMI is itching for a serious upgrade, and Callies heard the call. These billet 4140 main caps are here to bring some serious spine to your bottom end (no, not that bottom end… get your mind outta the crankcase).

Crafted from ultra-tough 4140 steel, these main caps are built to take a beating—track days, dyno pulls, angry revs in the driveway… bring it on. If your OEM caps are looking a little nervous under boost or high RPM, consider these their replacement with a protein shake and a gym membership.

Now, fair warning: these caps don’t just bolt on straight out of the box. The inner diameter is intentionally left a bit undersized, giving your favorite machine shop the opportunity to bore and hone them for a perfect fit. So yes, some machining is required, but that’s the price you pay when you’re building something beefier than a fast-food triple burger.

Perfect for anyone pushing the limits on stock HEMI blocks and needing the kind of precision and durability Callies is known for. Plus, you’ll sleep better at night knowing your rotating assembly is held together with something that wasn’t cast during the Jurassic period.

So, give your HEMI what it deserves—strength, support, and just the right amount of overkill. Your crankshaft will be grateful, and your machine shop will feel important. Win-win!