I just ordered a set of DSM 450's off the internet and I got them today
anyways upon examining them, the tip part, which is black plastic is cracked on 3 of them, and they can be spun...the forth one is fine and I can't spin it

is that fine or is that grounds for the injectors being damaged

Thanks

 

i beleave (i could be wrong), but if your talking about the black plastic at the bottom on the injectors, just take them off. they are guards that are to project it from damageing the injector itself. so technically, yes, they are damaged, will it stop them from working, no. the reason i say to take them off, is if the break loose (or part of it), that goes right into your cylinder... melted plastic in the cylinder isn't good. HTH.

 

You'll be fine.