BBK 1549 3/8" Phenolic Intake Manifold Spacer Kit for TFS, Trickflow Track Heat Ford 5.0L Intake Manifold 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