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Discussion Starter #1 (Edited)
I have a 460 .030 pump gas friendly ported dove-c heads 568/580's lift cam (solid flat tappet) believe it or not the car runs 10:[email protected] with a 1.48 sixty ft. O it has a 1050 dominator my dilemma is started out with 88 jets square and the car same to have a lean break went to 92 square and car would even take off change the front back to the 88 and run fine so decided to go up in the front to 90 and the break came back but not as bad and the car went from a 10.58 to a 10.56 and from a 1.52 to a 1.48 sixty ft. But lost two mph but a think that was from me short shifting so what is yall guys opinion where is the break coming from and y won't the car take the bigger jets in the front the back still has the 92 and have 36 degrees of timing
 

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Just a thought, if you changed the primary jets to a smaller size, you have leaned the whole carb. down. You are racing, going wide open from the start? If so, all air and fuel is going to the same place, taking the same path. If you're not going full on at the green, you're starting out on the primaries mostly, then you can alter the primaries to suit. All air/fuel is going into a common plenum. Thats how I look at it anyway.
 
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