An Up-Close Look at Holley’s New Throttle Body for NASCAR Sprint Cup Engines

After racing Holley carburetors for decades, NASCAR recently made the switch to fuel injection beginning with the 2012 season. But even with all the changes to the engines, Holley still plays a pivotal role in making these engines perform and survive the rigors of 500 miles of all-out racing. The famous carburetor manufacturer was tagged to build the throttle bodies used with the new fuel injected engines.

Ford FR9 Race EngineWhat many people don't realize (yet) is Holley uses much of the same design and technology in its street throttle body as the NASCAR racing unit. And the quality of both, honestly, is incredible.

I recently had the opportunity to work with Holley to produce this video showing not only how the new throttle body is being used, but also to pull the curtain back a bit on the new fuel injected Cup engines. A big thanks goes out to the engine builders at Roush Yates Engines and ECR who were willing to give us a behind-the-scenes look at what's involved and how Holley makes it happen.



2 Responses

  1. AJ
    Love those motors, too bad the racing isn't any better
  2. How to make a392 hem i scat pack get more power. And reliability

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