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 o-ring type bottom plugs 
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Joined: Tue May 06, 2014 5:34 pm
Posts: 42
Has anyone ever tried the o-ring type bottom plugs sold by quadrajetparts.com ? They seem to be quite easy to install and less time consuming than let's say tapping the holes and installing epoxied set screws.

Thinking about trying them for next couple of builds.


Thu Nov 17, 2016 11:09 am
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Joined: Fri Feb 08, 2013 2:37 pm
Posts: 1695
They fixed the secondary well plug problem in 1969 with the spun-in plugs, which I have never seen leak. Those plugs are essentially friction welded to the carb body. If the carb is 1968 or older it would have the brass cup plugs, which were the problem. The aluminum plugs with O-rings work OK in the early carbs, but the O-ring is susceptible to attack by fuel and so becomes a maintenance item.

If you want to use them because you are enlarging the passage from the jet to the well, I know Doug Roe's book advises enlarging that passage, but I haven't bothered with that since (40 years ago) the first couple times didn't seem to have noticeable effect. To be fair, I haven't touched that passage since using O2 sensors, neither NB in the stone age or WB in these modern times.

However, in companion with the upside-down E-tube with 4 bleed holes, the particular size of the vertical main well has a noticeable effect on secondary tip-in, as the volume of the well influences the amount of initial acceleration enrichment.


Thu Nov 17, 2016 8:42 pm
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