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Here's the backstory: The carb I'm currently running on my EA81 in my Coupe I pulled off of an '81 brat in a junkyard along with the manifold. My unit says its a DCP 306-16/304, has manual choke and a vacuum secondary. The venturi sizes are 20/27. The only reference I can find to a carb like that is the Hitachi unit from Nissan A12 engines from the 70s. My setup has a small flat spot in the acceleration which has had me looking at how to remedy that. I am going to try raising the float level a smidge or maybe getting some slightly larger jets. I think this carb can run this engine properly it just needs tuned a bit more. It's pretty close as it is. The carb for the Nissan A14 engines is larger, I believe** its a 23/27, don't quote me on that. If I cannot get mine where I want it to be, I will get the A14 carb and see how it works. All the Nissan spec carbs have mechanical secondaries which is nice too, and manual chokes. The main point of this whole story is that I have found new A12 and A14 carbs (Hitachi design, just like the stock EA carbs) online for $40-$50. If these work satisfactorily this could be a cheap way to get a car running again and look stock, no worries of sloppy throttle shafts, and no expensive Weber swaps with stupid looking air filters. I will report back with more info and testing. Anyone tried this already?
