24lb ev1 injectors?
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The second o ring definitely allows the bottom ring to seal, and stop it from seating too deep. I've run the double o ring since 09 without issue.
another option is to file the second grove in the top of the injector to fit the OEM clip. I did that on my first set of 39lb inj and it also retained them without issue.
Unlike the top grove that is cut 360 degrees around the injector, the second grove is partially cut with a tab at 12 and 6 o clock . File the tabs out and you can use the stock clips:

I've had a major tuning headache trying to get these bosch III 30's right in my car. The slopes in the voltage offset tables are significantly different than the stock GM injectors, and are not the same as the old fat top FRPP injectors (most got away with leaving the offset tables alone, changing only the injector flow rate, and tuned around it)
I got the ford voltage offset tables for these injectors, and the info from FIC to run them in an LS car, but none of it directly translates to run them in an LT1.
I swapped back to the 39lb cobra injectors that supposedly should not be run in a GM due to the dual spray pattern. My WOT tune is spot on with them, so at least I can hit the track and have fun with the car!

