Okay how can you tell which injectors are 850cc and which ones are 550cc? My friend has a pile of injectors laying in the back of his shop but is not sure of the size. Also on the very tip of the injectors are a 4 prong cap. What is the purpose of this cap? I have two injectors with a cracked prong and was wondering if the cap is necessary.

thanks
Kelvin

 

I think the primaries are a little longer.