I have a 750 DP that I just rebuilt (source of carb and previous performance is unknown). It' s very nice piece (w/ the 4 corner idle) and in like-new condition. The carb has the Holley Adjust-A-Jets on them and my problem is that I have no idea what the base setting should be in terms of how many screw turns out. I really don't want to foul the plugs or lean it out as this is a 462 w/ a 177 min-blower. We have the bung welded in the headder for the O2 sensor so that we can dial it in but where the heck would like an 80 size jet be in equivalent to the number of turns on the jet block???!!!! Anyone use these?? Help? :(

Wow...nobody? Can't get Holley on the phone on the weekends and internet searches yield no tuning tips...someone here has to know. :confused:

from the holley website:

.CORRELATION CHART
Jet Size to Metering Needle Adjustment (number of turns open)
60 = 1
62 = 1-1/8
64 = 1-1/4
65 = 1-1/2
66 = 1-5/8
67 = 1-3/4
68 = 1-7/8
69 = 2 70 = 2-1/8
71 = 2-1/4
72 = 2-3/8
73 = 2-1/2
74 = 2-5/8
75 = 2-3/4
76 = 3
77 = 3-1/2 78 = 3-5/8
79 = 3-3/4
80 = 4
81 = 4-1/2
82 = 4-3/4
83 = 5
84 = 5-1/4
85 = 5-1/2 86 = 5-5/8
87 = 5-3/4
88 = 6
89 = 6-1/2
90 = 7
91 = 7-1/2
92 = 8
93 = 8-1/2 94 = 9
95 = 9-1/2
96 = 10-1/2
97 = 11-1/2
98 = 12
99 = 13

Thanks!! I searched the site but was looking under "metering blocks" and "carb accessories" and "jets"......I just couldn't find anything. This is just an initial setting while the car warms up, then we'll use the O2 sensor to set it in. :cool: