Compatible with AMC 290-401. Chevrolet Small Block 262-400, Chrysler Big Block 383-440 Wedge Engines, Pontiac 326-455, and Oldsmobile 330-455; Headlock™ Bolts eliminate the need for lock washers, Period. That's because each Headlock™ Bolt features 24 equally-spaced, stainless steel teeth serrations that bite into and hold onto the attaching surface-eliminating the need for lock-washers.;.
Mr. Gasket 2230G Headlock Locking Header Bolts - 3/8-16 x 3/4 Inch - Set of 12 is ideal for applications requiring superior locking performance, ensuring consistent bolt tension and preventing loosening in various industries.
