A paper by Lars Grimsrud
OverviewHolley carbs have been used by hot rodders for many decades now. Holley offers a very tuneable, modular
carb design, yet it’s surprising how few people understand the basic tuning principles and procedures for
these carbs. This tech paper will discuss some basic tuning procedures and techniques to help you get your
setup optimized a little better.
Holley carbs have several operating systems, all of which can be tuned independently. Often, an improper
setup of one system will give false indications of a problem in another system. Attempting to cure Holley
problems by tuning the wrong system results in a really messed up carb, and a lot of frustration for tuners
and car owners.
Holleys have the following basic operating systems:
Idle System
Accelerator System
Main Metering System
Power System
Secondary System
These systems at times overlap in their operation. Not only does each system need to be properly tuned,
but its timing and “overlap” with other systems is critical to proper performance.
This tech paper will discuss basic set-up and tuning of Holley vacuum secondary carbs for optimum street
performance and drivability.
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