• Fits GM 2G carbs with 1 .438 Bores. ( About 1 7/16" )Please check before buying
• Bolt pattern 1.87 x 3.25". Please check before buying
• Includes Studs, flanged lock nuts and 2 gaskets made from Quality Felpro material
• .5" Tall Check our other listings for a 2" 1.5" or 1." version 
• Insulates carb from engine heat to stop vapor lock for better starting and drivability
• Longer runners make more power. 
• Every one is inspected and surfaced on both sides before shipping