This listing is for a brand new harmonic balancer bolt and washer kit from ARP that is made in the USA.

It fits big block Chevy 366, 396, 402, 427 and 454 V8 engines.

• Brand: ARP
• Part Number: 135-2501
• Head Style: 12 Point
• Socket Size: 5/8"
• Bolt Thread Size: 1/2" - 20
• Under Head Length: 1.550"
• Rating: 190,000 PSI

ARP has developed these ultra strong 190,000 PSI bolts that let you exert maximum clamping force. Special features include 1/4" thick, wide area washer and an extra tall 12-point head that accepts a deep socket and eliminates the worry of stripping the head