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Thread: 3 and 4 screw SU carbs

  1. #1
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    Question 3 and 4 screw SU carbs

    The 3 screw SU carb allows the coolant to flow through the base of the carb. The 4 screw doesn't. Does anyone know in what years the 3 screw and 4 screw SU carbs were offered? Was the 4 screw installed after the 3 screw ?

  2. #2
    Registered User AxtellZ's Avatar
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    i think the 3 screw were 70, then 4 screw were to 1972.
    you may check www.ztherapy.com for specific details- i don't recall the details. both my cars have 4 screw, FWIW they are supposedly easier to keep the dashpots moving freely with 4 screws rather than 3. Zya, JA
    Jeremiah Axtell, R.Ph
    Nunda, NY 73- 240Z, 74 -260Z

  3. #3
    Registered User Royce's Avatar
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    The 4 screw were used through the '71 model year. The 3 screw were used starting with the '72 model year. I have some of both but I haven't spent any time comparing them.

    Have fun!
    Royce
    '71 240 series II, Rebello L28/E88, ZX 5-speed, 3.9 R200, Tokico springs/struts(lowered 1.5"), short steering knuckles, 15x7 Revolution Wheels, 205/60 tires
    '67.5 Sports 1600

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