Holley float level sight plug holes

[Harry 6674]

They are supposed to be different heights. At least thats they way Holley makes them.
I believe the secondary is higher than the primary.

[bill dedman]

Thanks for that bit of information! I learn SOMETHING new, every day...

[Ed Wright]

Originally Posted by Harry 6674

They are supposed to be different heights. At least thats they way Holley makes them.
I believe the secondary is higher than the primary.

I always use a 7/16" drill bit as a gauge for the primary (front) and 3/8" for the secondaries.

[bill dedman]

Thanks, Ed; I am sure that's good advice! I'll follow it!!!

[BlueOval Ralph]

If its a square carb like a 750 same pri & sec vent and throttle blade size I make everything same float levels air bleeds and jets same

[bill dedman]

Ralph; it IS a 750... double-pumper with 4-corner idle jets. Going on a high-boost, turbocharged slant 6....

Thanks for the advice!!!


Bill

[BlueOval Ralph]

A good starting point with no Power valve is
Mj 77 or 78
HS bleed .026
Idle bleed .067 or .070
Idle feed rest in metering block .036 to .039
Set idle so blades are just below transfer slot.
At least .070 holes in throttle blades

[bill dedman]

Originally Posted by BlueOval Ralph

A good starting point with no Power valve is
Mj 77 or 78
HS bleed .026
Idle bleed .067 or .070
Idle feed rest in metering block .036 to .039
Set idle so blades are just below transfer slot.
At least .070 holes in throttle blades

Thanks Ralph.

This carb has a boost-referenced power valve that will be operational.

The cams for these turbocharged engines have very little duration (210/210-degrees @ .050"-lift,) and are ground with 115-degrees of lobe separation, so they idle like a stocker.

I guess turbo engines don't much like overlap...

I don't think that I'll need any holes in my throttle butterflies, will I???

Thanks for any information!!!

[Harry 6674]

Originally Posted by bill dedman

Ralph; it IS a 750... double-pumper with 4-corner idle jets. Going on a high-boost, turbocharged slant 6....

Thanks for the advice!!!


Bill

Are you doing the Hanger 18 mods to the carb?

[bill dedman]

Harry,

I had a friend of mine who has a successful turbocharged 225 slant six in a '70 Dart (11-flat at 122 mph running into a 15-mph headwind, at 3,300-pounds,) modify this carb for me for blow-thru, and I am not aware of what he did, beyond building a bracket that was needed, for some reason, to locate a boost-referenced power valve. The primary float had to be relieved, somewhat, to clear that bracket.

I am sorry I don't know more to tell you. I am not familar with the "Hangar 18" mods, whatever they might be. Can you enlighten me please?

Thanks for your interest!