1. 120k service has NOTHING to do w. injectors. A 120k service is typically the 2nd timing belt job done on a VG30DE motor.
Belt
Water pump
thermostat
tensioner & idlers
all cam & crank seals
vtc orings
vtc springs
accessory belts
inspect radiator, hoses and other such items. Additionally stock spark plugs are done every 60k
Fuel filter approx. every 15k also worth considering are replacing the PCV valves & related hoses. Injectors, valve covers, fuel hoses and such are services as needed and do not have anything to do with a 120k service. Now as for your injectors (pictures would help on your part) but from what I can see you are simply WRONG. Stock 370cc injectors are purple with age they typically fade to a grey color or even brown color. Stock 270cc injectors are red, they don't usually discolor much, at most they get a little darker. Venom sells 370cc injectors which are light blue colored, these are often sold on eBay and other on line stores.
I'm willing to bet that is what you have. To me it sounds like someone replaced dead injectors with the aftermarket blue ones, which is why they pop out so easy. The original injectors are the brown ones and they all likely flow 370cc. All the rest of your post is just made up drama. Stock 370cc new (right) old (left)
 Stock 370ccc used
 Stock 270cc
 Venom 370cc
 If you want to know for sure have them flow tested.
 Bernie Bilski berniebilski@cox.net
1995 Nissan 300ZX TwinTurbo in Cobalt Green
1997 Nissan 240SX SE in Ultra Red
ZCCNV #390 ~ ECZA #368 
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You are tossing misinformation left & right please slow down - 
05:38:25 01/12/14
