Stage 8 Locking Header Bolt Kit - 3/8"-16 x 1" External 12-Point - Steel - Nickel Plated - SB Chevy - Set of 12 28315M8 Silver Bullet throttle body spacers

Silver Bullet throttle body spacers create turbulence in the air flow just prior to entry into the engine increasing horsepower

Aggressive to Moderate Performance Tone and Improves Exhaust Flow

All springs are made of ductile iron (memory metal) and are shot-peened for additional strength

1965-1965 Avanti II

1975-1978 American Motors Pacer

Stage 8 Locking Header Bolt Kit - 3/8"-16 x 1" External 12-Point - Steel - Nickel Plated - SB Chevy - Set of 12 28315M8 Silver Bullet throttle body spacersStage 8 locking header bolts use a patented system that consists of a Grade 8 quality grooved hex head bolt, a retainer, and a snap clip. a retainer fits over the bolt head and locks the bolt against the header tube, and the snap clip holds the retainer in place. Once Stage 8 header bolts are tightened down, they won't back out, eliminating leakage and blown header gaskets from loose bolts. Made in the U. S. A. Stage 8 Locking Fasteners has provided