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The crankshaft turns inside the main bearings, and the caps that surround those bearings are clamped down by main bolts. Every combustion event pushes the crank against those caps. When an engine makes more power, revs higher or runs boost, that load grows. Weak or stretched fasteners can let the caps move, which wears bearings and can upset oil clearance. Builders replace the factory bolts to get firmer, more consistent clamping when they refresh or upgrade an engine.
You will find this section under Engine Components › Main Bolts. We currently have 3 products in stock here, all from ARP. Examples include the ARP Porsche 996 Main Bolt Kit and the ARP Subaru 2.0L FA20 Main Bolt Kit. Each is a kit made for a specific engine, so the hardware is matched to that block.
Confirm the kit matches your exact engine, not just the vehicle model.
Use the torque values and lubricant the bolt maker specifies, since these often differ from factory figures.
Ask your machinist whether the block needs checking or line honing after changing main fasteners.
Replace main bolts as a full set rather than mixing old and new hardware.
To narrow the list to parts for your engine, pick your vehicle to see what fits.
The crankshaft turns inside the main bearings, and the caps that surround those bearings are clamped down by main bolts. Every combustion event pushes the crank against those caps. When an engine makes more power, revs higher or runs boost, that load grows. Weak or stretched fasteners can let the caps move, which wears bearings and can upset oil clearance. Builders replace the factory bolts to get firmer, more consistent clamping when they refresh or upgrade an engine.
You will find this section under Engine Components › Main Bolts. We currently have 3 products in stock here, all from ARP. Examples include the ARP Porsche 996 Main Bolt Kit and the ARP Subaru 2.0L FA20 Main Bolt Kit. Each is a kit made for a specific engine, so the hardware is matched to that block.
Confirm the kit matches your exact engine, not just the vehicle model.
Use the torque values and lubricant the bolt maker specifies, since these often differ from factory figures.
Ask your machinist whether the block needs checking or line honing after changing main fasteners.
Replace main bolts as a full set rather than mixing old and new hardware.
To narrow the list to parts for your engine, pick your vehicle to see what fits.
