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Technical Requests
Welcome to the Technical Services E-mail System. To provide you with the most accurate and timely answers to your technical questions, please fill out the technical information section below. Please fill out the form as completly as possible. This will allow the techs to properly answer your questions without any delay.

For any carburetor questions, you must provide the list number of the carb off the air horn or body. Instruction sheets for many products can be downloaded free, and the Tech Service Library contains a wealth of information. Please keep in mind that some questions may better be answered over the phone. Please direct these to our Tech Service phone lines at:

Holley Performance:
Local 270-781-9741 between 8 am and 6 pm CST Monday - Friday, and between 9 am and 3pm CST on Saturday.

Please allow up to 48 hours for an answer, and thank you for your business!

Tech Service Request Form


Product Information
Type [Required] Part Number
Description [Required] Purchase Date
Your Contact Information
Name [Required] Email [Required] Daytime Phone
Your Vehicle
Make [Required] Model [Required] Model Year [Required]
Intended Use Type [Required] DriveType [Required]
Vehicle Weight Transmission Type Tire Size
Your Engine
Engine Brand [Required] Engine Size [Required] RPM Range [Required]
Vacuum at Idle Camshaft Type Cam Specs at
Lobe Sep Int Duration Int Lift
Exh Duration Exh Lift Rocker Type
Rocker Ratio Carb Type Carb List Number
Fuel Injection Brand Fuel Injection Type Intake Manifold
Compression Ratio Header Type Header Tube Size
Cylinder Head Type Supercharger Type Supercharger Pulley Sizes
Turbocharger Type PSI of Boost NOS Type
NOS Shot Estimate Horsepower Converter Stall
Rear End Ratio Desired level of performance
Your Question or Problem
Describe in detail your question or problem.

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