Holley 715 Install

[Drew Pojedinec]

A vacuum gauge hooked to any full time port can give you an idea of how the carb is seeing the engine.

[GeotechDuck]

Thank you for all the tips.  Just kept working on it. 

I have it running much cleaner now. Idling pretty steady at 500 RPM in drive. Not perfect but close.  Will continue to fine tune tomorrow. 

[deathsled]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

[Bob Gaines]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

No sight holes on the 3259 carb bowls unless you make them yourself.

[deathsled]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

No sight holes on the 3259 carb bowls unless you make them yourself.

Yes, true, but aren't there screws that can be removed and the car body nudged to see if gasoline comes out of the holes to indicate the level is up or alternatively if it pours out then the level is too high?  That is what I have on on my Holley 650 double pumper.  Otherwise how are the float bowls checked for proper level?  Or maybe the 715 doesn't need it?  Curious.

[Bob Gaines]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

No sight holes on the 3259 carb bowls unless you make them yourself.

Yes, true, but aren't there screws that can be removed and the car body nudged to see if gasoline comes out of the holes to indicate the level is up or alternatively if it pours out then the level is too high?  That is what I have on on my Holley 650 double pumper.  Otherwise how are the float bowls checked for proper level?  Or maybe the 715 doesn't need it?  Curious.

The bolt holes are above and below the optimum level so no those are not used for that purpose that is if you are referring to float bowl retaining screws. As previously stated the 3259 does not have the sight holes that your double pumper has. The float on the LeMans bowl carbs has to be adjusted dry and disconnected from the carb.

[deathsled]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

No sight holes on the 3259 carb bowls unless you make them yourself.

Yes, true, but aren't there screws that can be removed and the car body nudged to see if gasoline comes out of the holes to indicate the level is up or alternatively if it pours out then the level is too high?  That is what I have on on my Holley 650 double pumper.  Otherwise how are the float bowls checked for proper level?  Or maybe the 715 doesn't need it?  Curious.

The bolt holes are above and below the optimum level so no those are not used for that purpose that is if you are referring to float bowl retaining screws. As previously stated the 3259 does not have the sight holes that your double pumper has. The float on the LeMans bowl carbs has to be adjusted dry and disconnected from the carb.

I find that interesting but also much more labor intensive.  But that is how it is.  One has to adapt if one is to keep it original.  Mine is a day two car so...

[texas swede]

I had a similar problem on my 3259 and it turned out to be the adjustment of the flaps. It sucked gas through the groove
and I adjusted the flaps with the tiny screw that can only be seen with the carb turned upside down.
After that the carb has worked fine and reacting to the idle screws.
Texas Swede

[67350#1242]

If you have a stock unchanged 3259-1 it can idle with mix screws in due to massive idle feed. But it shouldn't run well.

Drew, are you saying all 3259-1 with the primary metering block #4756 came with the larger IFR?

I have an unmodified 3259-1 (Nov 66) that will idle well but idle screws only 3/4 turns out. 

Will changing to smaller IFR make for a cleaner (leaner) idle?

[Drew Pojedinec]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

No sight holes on the 3259 carb bowls unless you make them yourself.

Yes, true, but aren't there screws that can be removed and the car body nudged to see if gasoline comes out of the holes to indicate the level is up or alternatively if it pours out then the level is too high?  That is what I have on on my Holley 650 double pumper.  Otherwise how are the float bowls checked for proper level?  Or maybe the 715 doesn't need it?  Curious.

Dethsled, lemans bowl fuel level is set dry. If you want to check it while running, there are ways.

[Drew Pojedinec]

If you have a stock unchanged 3259-1 it can idle with mix screws in due to massive idle feed. But it shouldn't run well.

Drew, are you saying all 3259-1 with the primary metering block #4756 came with the larger IFR?

I have an unmodified 3259-1 (Nov 66) that will idle well but idle screws only 3/4 turns out. 

Will changing to smaller IFR make for a cleaner (leaner) idle?

Yeah so about this....
Idle itself isn't a huge deal. As you mentioned, to a large extent you can control with mixture screws.
The issue is the transition to the mains.
Basically you cannot control low throttle fuel. Typically running fat isn't a huge issue. But yes you can clean it up and tinker with it via idle restriction.

[deathsled]

What about the float bowls?  Not sure if that has anything to do with your issue but the float bowls should be at a level where just a little bit of gas leaks out of the hole once the screw is removed and the car is nudged to rock side to side.

No sight holes on the 3259 carb bowls unless you make them yourself.

Yes, true, but aren't there screws that can be removed and the car body nudged to see if gasoline comes out of the holes to indicate the level is up or alternatively if it pours out then the level is too high?  That is what I have on on my Holley 650 double pumper.  Otherwise how are the float bowls checked for proper level?  Or maybe the 715 doesn't need it?  Curious.

Dethsled, lemans bowl fuel level is set dry. If you want to check it while running, there are ways.

Thanks for the info, Drew.