JEGS 555-20518 Billet Aluminum Stud Girdles for Chevrolet Big Block 396-454 ci engines, made from CNC machined 6061-T6 aluminum, manufactured to precise standards, and anodized for a superior finish to give you more consistent high-RPM performance. Designed to reduce rocker stud flex, valve train fluctuation, and retain critical valve lash adjustments that provide more accurate valve lift and timing. Special machining has been done at the factory to accommodate crankcase evacuation components without the need for you to visit your local machine shop. They are easy to install with our step-by-step instructions.

JEGS 555-20518 Stud Girdle Kit Includes:

• (2) Stud Girdles: 19.375 in Long & 0.750 in. thick billet aluminum
• (8) Exhaust Valve Adjusting Nuts: 7/16 in.-20 x 2.050 in. L with 7/32 in. allen head set screw and 9/16 in. Hex head
• (8) Intake Valve Adjusting Nuts: 7/16 in.-20 x 2.600 in. L with 7/32 in. allen head set screw and 9/16 in. Hex head
• (4) Girdle Clamp Bolts: 3/8 in.-16 x 1.500 in. L
• (4) Girdle Clamp Bolts: 3/8 in.-16 x 2.250 in. L
• (4) Girdle Clamp Bolts: 3/8 in.-16 x 3 in. L

JEGS 555-20518 Stud Girdle Kit Notes:

• These Girdles will work on any Big Block Chevy head that uses the factory valve and stud angles