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SU carbs: which length float valves to use?


zigzag240

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I thought I had done everything possible on my '70 240, but this has stumped me. The forums have conflicting advice.....help is very welcome.

 

My car has an L28 and 4-screw SU's. I have no idea what actual year the carbs are. They may not have the original float bowl tops.

 

- The float "ears" in both bowls are the same length but I don't know if they are the "long" or "short" ones in a grainy photo at Z Therapy. '70s are supposed to have two long ears while the '71-72 a long/short.

 

- So I bought a pair of carb rebuild kits from Motorsport Auto, each kit comes with a long and short brass float valve. Motorsport had no idea which which length should be used.

 

My question: Do you use the long float valve with a "long ear" float cover? Or do you use the short one?

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