Accufab 4-Barrel 8500 Polished Competition Throttle Body

With drag strip testing results in hand, Accufab decided to put that thinking into a replacement for the 4-Barrel Throttle Body. In many race classes, racers are limited to a single 4-Barrel carburetor or a single Throttle Body. Accufab used a clean sheet of paper for this one and came to the conclusion that the standard intake manifold opening for the largest carbs available (the 4500 series) was just not adequate.

Accufab’s goal was to design a better 4-Barrel Throttle Body, not to try and fit it onto the existing 22-square inch 4500 series intake manifold inlet opening, an inlet opening that was originally developed in 1969.

Accufab’s concept was to develop a new 4-Barrel Throttle Body, with a 33- square inch area, a 50% increase, and let the racers (or the intake manifold manufacturers) come up with better intakes to match the increase in air flow. Racers are creative, they will figure out how to modify their existing 4500 series intakes to accept the 8500 Throttle Body (the bolt pattern is slightly larger) or better yet, use a sheet metal plenum style intake manifold.

Racers may use Accufab’s adapter (part number 8500ADP) to bolt the 8500 throttle body to any 4500 Dominator style intake manifold.

Exceptional Quality. These units, machined from billet aluminum and highly polished, can be used with either electronic fuel injection (EFI) or mechanical fuel injection. For an EFI application, the throttle body is CNC machined to use a Ford Mustang 5.0L 1986-1993 throttle position sensor (TPS). However, Accufab has an optional accessory to help adapt this Ford style TPS provision to be used with GM electronics instead. For example, we offer a TPS adapter to use your GM TPS.

Accessories Included: 8500 throttle body gasket.