another Carb question

[Hank70SS]

Originally Posted by chevymaher

I said weaker it should be stronger spring to fight the vacuum. I just brainlocked because i like them to open fast.

Originally Posted by mestorod70

The black spring is the heaviest and will delay the most.
Here is the order of the spring tension.
Black...brown...plain no color std spring...purple...yellow....and short yellow.
Displacement effects opening rate...biger engine earlier open.
When tuning you should not feel the secondary open...smooth is a faster car.
I would try the purple spring and see.

You both said heavier spring but as Shaun found out it was the lighter spring. It is confusing but a lighter spring as metorod70 suggested will delay the opening as the vacuum has to drop lower before the spring wins out over vacuum. In a heavy car like a Chevelle you need to delay the opening some, the engine needs a moment before it can handle the extra air fuel mixture from the secondaries. Check out the Holley manuals on tuning their carbs, it's explained in there.