Technical Request

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 5:30 pm CST Monday - Friday, and between 8 am and 2pm CST on Saturday.

Please allow up to two business days for an answer, and thank you for your business!

Your Contact Information
Name [Required]
Email [Required]
Daytime Phone
Product Information
Type [Required]
Part Number
Description [Required]
Purchase Date
Your Vehicle
Model Year [Required]
Make [Required]
Model [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
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Describe in detail your question or problem. [Required]