GTX Carb ?

[RJRENTON]

Weak springs would cause a lean condition, not rich.

Disagree.......weak or "tired" springs, would allow them to react faster to falling manifold vacuum or yield a richer mixture...... The spring tension on the step up piston lifts the metering rods sooner is tired.....yes??
BOB RENTON

 

[Geoff 2]

Nooo, weak springs would cause a lean condition.

 

[Photon440]

Disagree.......weak or "tired" springs, would allow them to react faster to falling manifold vacuum or yield a richer mixture...... The spring tension on the step up piston lifts the metering rods sooner is tired.....yes??
BOB RENTON

Springs push up the step up piston, vacuum pulls down. When the spring is weaker, the metering rod stays in the jet longer, preventing enrichment.
By the way, the springs may not necessarily be weak or tired, they could be just the wrong ones. These springs are available in five steps to react from 3"Hg up to 8"Hg of vacuum.

 

[62 Dart Convertible]

Disagree.......weak or "tired" springs, would allow them to react faster to falling manifold vacuum or yield a richer mixture...... The spring tension on the step up piston lifts the metering rods sooner is tired.....yes??
BOB RENTON

No, a stronger spring will allow the step-up to react faster to falling vacuum and enrichen...

 

[Some Car Guy]

Appears there isn't a spacer just gasket.

You’d be better off with at least a 3/8 spacer. Might find some small power, but definitely will help with heat soak. Many to choose from.