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changing out flattops with earlier SUs


atomrat

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I have a 73 with the stock flattop carbs on it. I was thinking about going to the round top SUs. Are the round top SUs from a Rodster compatible with a 240Z? Or do I need to stay with the SUs from a 240Z. And do I need to or should I also change out the intake manifold? What are some of the things that I need to keep an eye out for when doing the switch.

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Atomrat: I can't answer the specific questions you asked, but I can tell you that the linkage for the round top carbs is different from the stuff you got on the flat-tops. You'll need to get linkage as well as carbs is what I'm saying.

Good Luck

------------------

Carl Stahlnecker

72 240Z "Bambikiller"

HLS30-55703 11/71

cstahlnecker@hotmail.com

bambikiller240@altavista.com

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I made the conversion you are asking about. I don't know about the roadster question because I do not know what SU's are on that car.

The correct SU carb is the Hitachi HJG46W. Mine came off of a '72z but had leaky thottle bodies. I remidied the situation by calling Scott at Z Therapy and getting a reworked set from him with a rebuild kit for the remaining parts and pieces. Discard the intake manafold as well or attach it to your boat for an anchor. I have cannabalized some of the manafold 'plugs' and fitting from the flattop setup but that all.

While adjusting my emmision control systems a bright flash of light initiated a consise eurika moment and I trashed the enitre system as well, with substantial increased performance and cooler high RPM operation.

Good luck. Talk with Scott, he is very knowledgable about these mods although he will always try and sell you the "shiney" ones.

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