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i have a set of 4 screw s.u.'s on my 240 with a n-36 intake. i came across a very nice set of 3 screw s.u.'s and was wondering if they would be any better. i had heard that the 3 screws were the ones to have. thanks for your help,tim
 

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No, there's no difference in performance. The 4 screws are a little less prone to sticky nozzles.
 

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4 screws are the ones to have assumong the needles are stock. they are the earlier 240z carbs. from 70-early 71. these have better performing needles in them as they did not have to worry about emissions quite as much. bottom line, if both are tuned perfectly the 4 screws will perform better. in the real world, whichever set is in better shape will make your car the fastest.
 
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