ARP 400-1111 Header Bolt & Stud Kit for Chevrolet Small Block. 1.000˝ UHL ymm_75 S-BM/T/17H and E-BM/SS/8 must be

S-BM/T/17H and E-BM/SS/8 must be ordered for cars without otto / gasoline particulate filter

The studs are manufactured from a proprietary alloy developed by ARP (Stainless 300) and are impervious to the rust and corrosion that plagues ordinary fasteners

Head Studs vs Bolts: On many street-driven vehicles

accurate adjustments

all allied to a smooth sound that enhances the car’s engine tones without any discomfort or drone for the occupants

ARP 400-1111 Header Bolt & Stud Kit for Chevrolet Small Block. 1.000˝ UHL ymm_75 S-BM/T/17H and E-BM/SS/8 must beSpecifications Socket Size(s) 3 8 hex UHL (Qty: 12) 1. 000 Thread Size 3 8 washers included