i agree with double.. isnt it a vac secondary ?
*edit* on a holley
vac sec wont open just revving the engine in neutral. there has to be a load. the secondary idle enrichment comes from the amount of transfer slot showing in the secondaries.
on a stockish engine i use boxes. the slot is as long as is wide... or .020 whatever it sez.
on a mild or hot build i like a box and a half.
Last edited by spinn; 06-20-2006 at 09:12 AM.
Reason: holley example explaination