SPECS：

Bolt Size3/8-16 x 3/4
Collector Diameter：3.50 inch
Emission Code4
EngineChevrolet ：Small Block Gen I
Header FinishSilver Ceramic
Header Style：Long Tube
Primary Tube Dia；1-7/8 inch

Tube Material：304SS

Features:
All necessary hardware included for a complete installation
Designed for optimal performance
Industry’s best welds for durability
5/16” machined flanges for a perfect seal
Long transition collector for decreased back pressure
Light weight & sturdy 18 gauge tubing
Mandrel-bent tubing for smooth exhaust flow
Tuned-length primary tubes for maximum exhaust scavenging and velocity