12 BOLT CHEVY/OLDS-PONTIAC

All drilled rotor hats have 5 on 4-1/2", 5 on 4-3/4", and 5 on 5" bolt circle wheel lug patterns with 1/2" holes as well as 8 5/16-18 NC Threaded holes on a 7" bolt circle for rotor mounting.

Wilwood's HD Series hats are manufactured from premium grade aluminum alloys offering high strength, low weight, and show quality appeal. HD hats feature a straight bell construction with a flanged rotor mount ring. These features combine to provide maximum radial clearance between the caliper body and the hat. This can be a critical factor when trying to squeeze a large caliper inside a small wheel. When used with matching Wilwood rotor hardware, these hats provide solid mounting for a wide range of custom and competition disc brake applications.

Wilwood – The Leader in Brake Innovations

Wilwood Engineering designs and manufactures some of the best high performance disc brake systems and components available.

While Wilwood is best known for their brake systems used in all types of motorsports, they also manufacture brakes specifically designed for utility and all-terrain vehicles, snowmobiles, motorcycles, military vehicles, agricultural equipment and industrial applications.

It's this cross-industry involvement that allows Wilwood to gain valuable engineering knowledge.

The Chassis Shop is pleased to be a longtime supplier of Wilwood brake systems.