Holley Carburetor Tuning Tricks

holley transfer slot adjustment   Dan crystal vault slot

You will first remove the sight plug, then to make your adjustment you will need to loosen the lock screw on the needle and seat This will allow you to turn

In the idle condition the transfer slots should give the appearance of a small square when viewed from underneath the base plate  When I had the carb mounted with this setup it seemed to run way nicer at idle After setting the transfer slots both primary and secondary to

itemku higgs slot Holley has this little screw that adjusts the secondary throttle YEAH When looking from under the carb, the idle stops should be adjusted so that only a little of the transfer slots are showing under the throttle