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Whats the deal with Holley jets #s 88 /89 /90.... they all have the same size hole

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The diameter is the same the, the angle (taper) on the back side of the hole is not According to Holley that is why they, the bigger numbered jets, flow more

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Thankx guys It seems when I jet down from 90s to 88 there is very litle change - LM1- I go to 87 and go way lean, some what the same when I go to 91s

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Which carb, brand, size and type, are you working on? If it is a stock Holley which List number is it with the dash number, IE List 4781-9 ?

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Yep... went from 31 to 29 on the HSAB after the first jetting from 88 to 90 showed no change, this make it too fat so I went down to 87s which made it too lean , the air temps were all over the place that week also so I switched to another carb that worked but was too small cfm wise its a demon 850 w/annular boosters which limits my rpm, We just stopped racing for the winter so I have some time to get it right, don't have that many HSABs to test with right now or too much experience fooling with the bleeds.

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I would want to try #88 jets with a #30 HSAB. You really need to keep in mind when the weather is changing it is almost impossible to tune the carb. to perfection due to the changing temps, humidity and barometric pressure changes Humidity is a real big deal on tuning, water molicules really spread the oxygen molicules out, as you know water don't burn worth a hoot , even in alcholol I haven't play with any of the B.G. King Demons to speak of so I'm not much help, sorry