906's red vs blue springs

[73-charger-383]

...sorry if this has been covered, but i wasn't able to find it in a search.

I recently pulled of one of my old heads on account of a busted exhaust stud (and to match the 906 head on the other side)...I had three different 906's laying around, and started cleaning them up and inspecting them.  Two of them have red springs, with the retainers have three grooves, while the other has blue springs and two grooves.. I'm assuming the red springs are HP heads, and the blue are standard, right? 

[WINGMAN]

  Yes you are right. Wingman.