Beyea Dirt Late Model Tri-Y Headers - SB Chevy 360-420 cu. in. w/ 18 Degree BRODIX Spread Port Heads - Tube Diameter: 1-3/4" x 1-7/8" x 2" - Collector Diameter: 3-1/2" Thread File this makes these manifolds 75%

this makes these manifolds 75% thicker to combat cracking due to high exhaust temperatures

Single 3/8 in Hole

with an offset inside diameter that is designed to install with the thicker side of padding toward the driver and a perforated seam to make installation easier

1981-1986 Pontiac Bonneville

Beyea Dirt Late Model Tri-Y Headers - SB Chevy 360-420 cu. in. w/ 18 Degree BRODIX Spread Port Heads - Tube Diameter: 1-3/4" x 1-7/8" x 2" - Collector Diameter: 3-1/2" Thread File this makes these manifolds 75%Product Description: Headers Dirt Late Model Tri Y 1. 75 to 1. 875 to 2 in Primary 3. 5 in Collector Steel Black Paint 18 Degree Head Small Block Chevy With more than 15 years in the header fabrication business, Beyea Custom Headers knows how to customize your power curve to create a broader range of power. Each Beyea Custom Headers has been tried and tested. Beyea Custom Headers are used by many of the top Modified and Late Model race teams and