Give me a "duh" on carb floats

[billschroeder5842]

I did a carb swap a couple of weeks ago. I replaced a Eddy with a Holley 750 Vacuum secondary on my 383. The car ran well but lacked punch.

Yesterday I finally got around to adjusting the float level bring it from the factory spec that was about .75% covering the sight glass to just barely about the bottom of the sight glass.

What a difference that seem to make. The car runs SO much quicker--it is like a completely different car. I can pretty much "light 'M up" anytime I punch it under 35mph with my AT. Feels MUCH better.

So duh...can a float level make THAT much difference?

Anything else I should check? Timing?

[Cooter]

Oh yes, that's the good thing about a Holley Carb....Once you get it dialed in, there's no comparison. Too much fuel will bog as well as too much air.

[oldschool]

you can adjust the whole fuel curve, by changing the float level. sounds like you were really rich before. you still might be.......

[billschroeder5842]

So, how does one know if they are rich or lean? I made the adjustment to the bottom level of the site glass per specs......what else should I look for?

[firefighter3931]

So, how does one know if they are rich or lean? I made the adjustment to the bottom level of the site glass per specs......what else should I look for?

The plugs will tell you what is going on as far as jetting. A light brown/tan color is what you're looking for. 

Light grey/white is too lean & dark grey/Charcoal is too rich 

Did you install the 20-7 throttle adapter ?


Ron

[billschroeder5842]

Yes, I have the 20-7 installed....it made it SO much easier.

I'll check the plugs and see whats up.

thanks!