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scicala · 10-02-2020, 02:17 PM

"I believe that the chance of leakage from the bowl is very low. But I learned a long time ago not to say that it can never happen. If something is loose, cracked, or deteriorated then it could be possible."

I don't know if you've had a Holley 4000 four barrel carb apart before, but in my opinion, for the bowl to actually leak down (not talking about evaporating), it would need to have a crack or porosity in the bowl, or take a hammer and make a crack in the bowl. Porosity would show up when new, and never make it to production.
In the hundreds of these carbs that I have done, I never saw any with porosity enough to leak.
By the number of people today complaining about this type carb leaking down, I would have to say the lack of fuel for a cold start is because of heat, boiling fuel and/or evaporation.

Sal

10-02-2020, 02:17 PM	#10
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,706	Re: My T Bird is a 292 bored 40 over I found "I believe that the chance of leakage from the bowl is very low. But I learned a long time ago not to say that it can never happen. If something is loose, cracked, or deteriorated then it could be possible." I don't know if you've had a Holley 4000 four barrel carb apart before, but in my opinion, for the bowl to actually leak down (not talking about evaporating), it would need to have a crack or porosity in the bowl, or take a hammer and make a crack in the bowl. Porosity would show up when new, and never make it to production. In the hundreds of these carbs that I have done, I never saw any with porosity enough to leak. By the number of people today complaining about this type carb leaking down, I would have to say the lack of fuel for a cold start is because of heat, boiling fuel and/or evaporation. Sal