RickR
06-15-2004, 08:08 AM
I need second opinions before I start drilling holes :boggled:
Holley 800 (4150) HP 500 carb, mechanical secondaries, choke removed, idle mixture screws on primaries only.
HP 500
9.4/1 compression
Cam retarded 3 degrees
Gil Mag Choice
MSD
Very little response to idle mixture screws
New engine, idle is VERY GOOD when the engine is at normal operating temp
But when engine is below normal operating temp it's loading up at idle and off idle.
At OE setting the primary transition slots are NOT exposed BUT the secondary slots are exposed about 1/16"
I tried closing idle setting on secondaries (1 full turn so slots not exposed) but to get an idle I had to open primaries to the point that primary transition slots are exposed At that setting the primary idle mixture screws worked.
Should I drill holes in the butterflies? What size?
THANKS!
Holley 800 (4150) HP 500 carb, mechanical secondaries, choke removed, idle mixture screws on primaries only.
HP 500
9.4/1 compression
Cam retarded 3 degrees
Gil Mag Choice
MSD
Very little response to idle mixture screws
New engine, idle is VERY GOOD when the engine is at normal operating temp
But when engine is below normal operating temp it's loading up at idle and off idle.
At OE setting the primary transition slots are NOT exposed BUT the secondary slots are exposed about 1/16"
I tried closing idle setting on secondaries (1 full turn so slots not exposed) but to get an idle I had to open primaries to the point that primary transition slots are exposed At that setting the primary idle mixture screws worked.
Should I drill holes in the butterflies? What size?
THANKS!