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no. theres no difference in the flow rate versus top and side feed. as you know, top feed are the "norm", everyone uses it and its VERY easy to get opposed to side feeds. thats the only difference. the guy that told you that is a moron.
only differences you should be worried about are injector impedences. HI or LOW. That'll cause the injectors to act retarded if the wrong ones are used via what your ecu is tuned for. SR's and KA's run high impedence injectors, if you wanted to get injectors from a different car, lets say a DSM, and convert to a top feed fuel rail, then you would have to get whats called an injector resistor box since the DSM injectors are low impedence. This box converts the high impedence signal to the injectors from the ecu to low impedence.
One other thing to keep in mind, are injector size which are measured in lbs/hr or cc/min. you want to use the correct ones because, again, the ecu is tuned for a specific size. Granted, you could use slightly bigger ones, but you'll just run rich constantly and your fuel consumption will be a course for concern with gas prices like they are today. If you plan to do motor work and feel as if you need bigger injectors to accomodate for the work the best bet is to ask a tuner, someone who actually knows what they are talking about/ actually dyno tunes vehicles and get their opinion as to what size you should run.
IMO, just stick with the 270cc's that are on the KA already, advance the timing 5º and that'll give you a little bit extra kick aside from building the motor, for the time being.
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