B&B's Heavy Duty Distributor Clamps are designed to keep the ignition timing where you want it, without the extra bulk of other aftermarket clamps. Their flat design provides ample distributor clearance and permits easy access to the hold-down fastener. Precision die-cut from extra-thick steel, B&B clamps are much stronger than factory clamps. They fit all Chevrolet big-block and small-block V-8's, and 90 degree Chevy V-6's. Stud and nut are included.