Top Street 81141BK GM LS 105mm Cast Aluminum Throttle Body Elbow w/4150 Flange

TSP GM LS 105 mm Black Cast Aluminum Throttle Body Elbow with 4150 Flange If you're looking for a unique way to switch from carb to EFI, TSP's 105mm throttle body elbow will help get the job done. Composed of cast aluminum, it features a Holley 4150 style flange and stock 4-bolt pattern, and it comes in satin, black, or polished finishes.