The Hilborn EFI-R injector manifold kits combine the technology of Electronic Fuel Injection with the racing born performance and aggressive looks of Individual-Runner engine induction. Hilborn Injector manifolds are a true individual runner (IR) manifold, providing the best all-around power output and drivability of any other induction system. A true IR does not suffer from the disruptive cylinder to cylinder reversion pulses associated with a common plenum intake or IR manifolds with a plenum chamber. These pulses promote fuel separation from the air carrier, the slowing of air movement in the manifold, and the inability to realize engine potential due to poor cylinder fill and burn characteristics in the combustion chamber. However, the IR design of the HILBORN manifold isolates these pulses, allowing the engine to make more bottom end torque, have increased throttle response and, most importantly, to accelerate faster. Most applications will also see a significant increase in top end power. Elimination of these reversion pulses is also responsible for our excellent low speed drivability, even with aggressive camshafts. Enhanced engine performance and drivability all in one package? Yes, with a Hilborn EFI system on your car, you can experience a total transformation of your engine. It is possible to have the best of both worlds with a HILBORN. The Hilborn EFI-R injector manifold kits are designed to allow you to combine the technology of Electronic Fuel Injection with the racing born performance and aggressive looks of Individual Runner engine induction. The engine valley covers are sold separate to allow the customer to choose the correct valley cover kit based on the engine deck-height, 300-802 - Std. 9.800-inch height or 300-803 - Tall 10.200-inch. What's included: Cast aluminum intake manifold with eight 3.00" individual throttle bodies (ITBs). Two aluminum fuel rails with fittings mounted on custom brackets are included, choose your own fuel injectors based on your Chevy's needs. Three wire throttle position sensor (TPS) Linkage between the throttle bodies. The required valley cover, which is sold separately based on your engine's deck height, includes the cross-link to tie the two banks of ITB linkage together. A remote thermostat housing and fittings for the coolant crossover, just add your own lines accordingly. Vacuum kit A synchrometer for optimizing throttle body butterflies. No control unit is included, allowing you to choose the unit you want based on the features you need Optional ram tubes or velocity stacks are also available for tuning of runner lengths for performance or to get that classic vintage Hilborn mechanical fuel injection look.