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Holley 97-320
Holley Harmonic Balancer Bolt - Chevy Small Block - 12-Point; Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Small Block 283-400 with Holley Mid-Mount Accessory Drive System 20-240 & 20-240BK
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Holley 97-321
Holley Harmonic Balancer Bolt - Chevy Big Block - 12-Point; Replacement Harmonic Balancer Bolt with Thick Washer, for Chevy Big Block 396-454 with Holley Mid-Mount Accessory Drive System 20-242 & 20-242BK
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