Holley EFI Throttle Position Sensor - 2 bbl. TBI (502-3/502-4/502-5/502-6/502-7/502-8) 4 bbl. Pro-Jection (504-1/504-2/504-11/504-12/504-13/504-21/504-23) 79999410 Hedman Hedders 2-1/2" 3-Bolt Flange

Hedman Hedders 2-1/2" 3-Bolt Flange O2 Header Reducers For 2-1/4" Exhaust System

3/8 in Slot Head

13/16 in 36 Spline to 3/4 in Double D

AFR's trademark 3/4'' thick head deck makes them ideal for heavy nitrous or blower applications

The silicone palm and touchpoints give superior grip and limited bunching

Holley EFI Throttle Position Sensor - 2 bbl. TBI (502-3/502-4/502-5/502-6/502-7/502-8) 4 bbl. Pro-Jection (504-1/504-2/504-11/504-12/504-13/504-21/504-23) 79999410 Hedman Hedders 2-1/2" 3-Bolt FlangeHolley is quickly becoming The New Standard In EFI! Holley's HP ECU is standard equipment on the 2013 2014 Chevrolet COPO Camaro and Holley's EFI throttle body powers every NASCAR Cup Series team. Top racers are making the switch to Holley EFI every day. Racers like Tom Bailey who set three new records and took the overall event win on the 2013 Hot Rod Magazine Drag Week and John Scali who used it to win the 2013 JEGS All Star race. But that's not