reguser
07-08-07,
I bought a holley 4160 from summit and it says there are different weight springs that go in the vacuum secondary diaphram. Purple is suposed to be the middle weight. The lighter the springs allow the secondarys to open up faster for lighter cars and the heavier springs open up later for heavier...
More... (http://forums.corvetteforum.com/showthread.php?t=1752316&goto=newpost)
More... (http://forums.corvetteforum.com/showthread.php?t=1752316&goto=newpost)