Wilson 2320 CFM Billet Throttle Body 2.55 Bore 4500 Flange AA0220BG2T57 PN 8225Special oil tract improves 80003 PN 8225Special oil tract improves lubrication to the distributor and cam gearNylon pads ensure smooth operation of the advance weightsAdvance weight pins are staked and tig welded to the plateMechanical advance assembly can easily be locked outAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionPolished steel shaft is QPQ coated and guided by a sealed ball bearingCNC machined billet aluminum housing and billet aluminum baseVacuum advance canister for improved economy (can be locked out)Easy to adjust mechanical advance with supplied springs and stop bushingsCARB E Direct plug in to factory connectors and fuel rails Wilson products are designed to handle much more power than OEM parts and are used by top racing teams around the world