can anyone tell me what cc these injectors are?they are yellow in colour but have one jet on the end instead of the normal 4.i was told these are 550s but im unsure.can anyone help?pics to follow

 

 

Best way to tell mate would be to send them away and get them cleaned and flow tested, especially if your not sure of them. All it would take is for one not to be producing the proper spray pattern and your looking at a melted piston, i've had a friend do this with a Cosworth, expensive lesson.

 

anyone have any 550s that look like the above?

 

normal colours:
380 grey
440 yellow
550 blue/purple
740 red

these are for side feed classic injectors and are only a guide.
1 hole in the pintle was generally phase 1 (94/8) and multi hole was phase 2 (99/00)