Holley reverse-idle model tuning

holley transfer slot adjustment   Dan slot streams

While the carb is off adjust the throttle plate so roughly 040 of the transfer slot is exposed (the slot should appear square once this is

In the idle condition the transfer slots should give the appearance of a small square when viewed from underneath the base plate  The best way to go about it is to take the carb off, turn it upside down, and eyeball the amount the slot is exposed with the throttle

firebird spirit slot the throttle plate and the transfer slot Applications using a larger cam NOTE: The Holley 4150 ALUMINUM HP includes the secondary idle adjustment lever that Here is what I did: I drained the float bowls, pulled the carbs and set up the throttle blades on all the venturis so that the transfer slot was