Free Shipping on All Wheel & Tire PackagesAuthorized Dealer — 100% Genuine WheelsPrice Match Guarantee on All ProductsExpert Fitment Support — 10,000+ Customers ServedPay Over Time · No Credit Needed with Snap
Select your vehicle to see Main Cap Bolt Kits that fit
Main Cap Bolt Kits
Main cap bolts hold the main bearing caps to the engine block. Those caps clamp the crankshaft in place, so the fasteners that secure them take serious loads every time the engine fires. Some engines also use side bolts that pass through the block into the caps to help keep them from shifting. Builders replace these bolts during a rebuild or when adding power, because upgraded fasteners help the bottom end hold its clamping force under higher stress.
We currently have 3 main cap bolt kits in stock, all from ARP. Options include the ARP Ford Modular V8 Main Cap-Side Bolt (Early Alum Block) M8 and the ARP Ford Modular V8 Main Cap-Side Bolt (Late Alum Block) M9. Both are cap-side bolt kits for Ford Modular V8 aluminum blocks.
Confirm your block version, since early and late blocks can use different bolts.
Check that the thread size in the kit matches your block.
Inspect and clean the threads in the block before fitting new hardware.
Follow the bolt maker's torque values and lubricant instructions exactly.
To narrow the list to parts that suit your engine, pick your vehicle to see what fits.
Main cap bolts hold the main bearing caps to the engine block. Those caps clamp the crankshaft in place, so the fasteners that secure them take serious loads every time the engine fires. Some engines also use side bolts that pass through the block into the caps to help keep them from shifting. Builders replace these bolts during a rebuild or when adding power, because upgraded fasteners help the bottom end hold its clamping force under higher stress.
We currently have 3 main cap bolt kits in stock, all from ARP. Options include the ARP Ford Modular V8 Main Cap-Side Bolt (Early Alum Block) M8 and the ARP Ford Modular V8 Main Cap-Side Bolt (Late Alum Block) M9. Both are cap-side bolt kits for Ford Modular V8 aluminum blocks.
Confirm your block version, since early and late blocks can use different bolts.
Check that the thread size in the kit matches your block.
Inspect and clean the threads in the block before fitting new hardware.
Follow the bolt maker's torque values and lubricant instructions exactly.
To narrow the list to parts that suit your engine, pick your vehicle to see what fits.
