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Select your vehicle to see Main Bolt Kits that fit
Main Bolt Kits for Performance Engines
Main bolts hold the main bearing caps to the engine block, and those caps keep the crankshaft located in its bores. When an engine makes more power or revs harder than it did from the factory, the caps can shift under load. That movement can damage the bearings and the crank. A main bolt kit replaces the original fasteners with a matched set designed for consistent clamping force. That is why many builders fit one during a rebuild or a performance build.
This category, found under Engine Components › Main Bolt Kits, currently has 1 product in stock. It is the ARP SB Chevy 4 Bolt Main Bolt Kit from ARP, listed for the Chevrolet Small Block.
Before you order, keep these points in mind:
Confirm that your block's main cap layout matches the kit, since two-bolt and four-bolt mains use different hardware.
Follow the fastener maker's torque and lubricant instructions exactly.
Ask your machinist whether the block needs align honing after the main fasteners are changed.
Decide whether bolts or studs suit your build and how often you plan to take the engine apart.
To check fitment for your engine, pick your vehicle to see what fits.
Main bolts hold the main bearing caps to the engine block, and those caps keep the crankshaft located in its bores. When an engine makes more power or revs harder than it did from the factory, the caps can shift under load. That movement can damage the bearings and the crank. A main bolt kit replaces the original fasteners with a matched set designed for consistent clamping force. That is why many builders fit one during a rebuild or a performance build.
This category, found under Engine Components › Main Bolt Kits, currently has 1 product in stock. It is the ARP SB Chevy 4 Bolt Main Bolt Kit from ARP, listed for the Chevrolet Small Block.
Before you order, keep these points in mind:
Confirm that your block's main cap layout matches the kit, since two-bolt and four-bolt mains use different hardware.
Follow the fastener maker's torque and lubricant instructions exactly.
Ask your machinist whether the block needs align honing after the main fasteners are changed.
Decide whether bolts or studs suit your build and how often you plan to take the engine apart.
To check fitment for your engine, pick your vehicle to see what fits.
