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Yes the SOHC injectors are held in place when bolting down the rail, so there is no way to test the actual spray pattern without some magical special equipment. About the only test you can perform is an impedance test. Just put your multimeter on the 0-200 ohm scale (or the lowest scale) and measure the resistance between the 2 "prongs" on the injector. It should be 2-3 ohms. If it is higher or lower replace the injector. If the impedance checks out ok, but you still suspect an injector (leaking into the intake or bad spray pattern) replace all the injectors. I would do it anyway just to be on the safe side. I got a set of high flow python injectors for about $250.
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