The main caps are responsible for holding the crank in the engine. It is the main cap bolt's job to make sure the caps stay put. With thousands of pounds of force generated by the reciprocating assembly, using a main cap bolt from the spare bolt pile may not be the smartest move and may be in fact dangerous...why risk it?

Part# IN-M12

Main Cap Bolt, 426 Hemi (kit) - High quality aftermarket grade-8 bolts for all 1966-71 426 Hemi engines. Includes: main cap bolts, cross-bolts, rear main seal retainer bolts and washers.

Compatibility: 1966 - 1971 - All Mopar - Availability: Special order

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Part# IN-M12