ARP 430-7401 Thermostat Housing Bolt Kit for Chevrolet. SS. 12pt ymm_24 170˝ Thread Size 1/4-20 Material:

170˝ Thread Size 1/4-20 Material: Stamped Steel

Manufactured in the USA

750˝ Thread Size 5/16-18 Fastener Style: Bolt

Typical tensile strength is 260

If the car is not equipped with performance exhaust and you want to use the Akrapovic sound kit than Akrapovic sound kit P-HF1003 together with Actuator set P-HF1006 has to be ordered

ARP 430-7401 Thermostat Housing Bolt Kit for Chevrolet. SS. 12pt ymm_24 170˝ Thread Size 1/4-20 Material:Specifications Socket Size(s) 3 8 12pt UHL 1 (Qty: 1) 2. 000 Thread Size 1 3 8 UHL 2 (Qty: 2) 1. 000 Thread Size 2 3 8 Fastener Style: Bolt Finish: Polished Head Type: 12 Point Material: Stainless Steel Package Type: Skin Supported Vehicles: Chevy 150 1955 1957 210 1955 1957 3100 1956 1959 3200 1955 1958 3400 1955 1958 3500 1955 1958 3600 1955 1958 3700 1955 1958 3800 1955 1958 3B 1959 3C 1959 3D 1959 3E 1959 3F 1959 3G 1959 Bel Air 1955 1975, 1981