Holley came out with the first modular carburetor, the 4150, back in '57. Today, Holley still makes the 4150-heck it even makes hopped-up versions for everything from drag racing to rock crawling. With times getting tough, a brand-new shiny carb may be out of reach for some enthusiasts, but a decent used carb may not. There always seems to be a guy at the swap meet or a friend of a friend that has one ready to be fixed up.inline_mediumwraptextright26956193/technical/engines_drivetrain/accessories_electronics/sucp_1004_holley_4150_carb_rebuildsucp_1004_40+holley_4150_carb_rebuild+rebuilt_carb.jpgTrue