Aluminum Street HP Carburetor 750 CFM 4150 Vacuum Secondaries Shiny Gasoline HolleyTire smoking performance has never been so affordable! The all new Aluminum Street HPs weigh up to 40 percent less and are even easier on your wallet. Holley is proud to introduce the all new Aluminum Street Hptm. They utilize the best features from Holley's Race Bred 4150 Hptm carbs, but are tamed for street and light competition use. The Street HP features an aluminum contoured main body design taken from the race winning 4150 Hptm and has a tumble