Ok I've gotten all my 680cc 84-85 RX7 injectors together and I was in the process of cleaning them up and found a hairline crack down the nylon casing around the pintle on one of them. Can I still use this injector?

 

I would toss 'em. Even if they work fine now, why wait for it to become a problem? Fix what you can while you can IMO.

 

Yep, if you use it, it could cause a much bigger problem. Nip it in the bud.

 

hmm, intesting. I'm gonna test the injector to see if it will hold rail pressure, if all goes well i'll take it out on a run and then check the plugs