BBK 1506 3/8" Phenolic Intake Manifold Spacer Kit for GT-40 and Cobra EFI Intake Manifolds BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and Built Non Heat Transfering Phenolic Material Reduces Upper Intake Manifold Temepratures for Reduced Air Intake Temperatures Cooler Intake Temperatures Allow Denser Air For Improved Performance Offers Increased Valve Cover Clearance for Larger Rockers and Valve Covers Easy to Install - Includes New Longer Hardware and 2 New Gaskets