I have a tri-carb and the front intake manifold has a small plug with
a square top and a larger 5/8" slotted screw plug. They are both
steel. The smaller one is 3/8 - 28 TPI. I cannot see the other one
very well but it appears to be a coarser thread. The small plug is
solid and the square portion is 1/4" long and the threaded portion is
7/16". I took it out to measure it. It is possible that someone may
have used red locktite which takes heat to break.
Do you have a square easy-out? That might help once you have a hole
drilled deep enough for it to grab. If you are having a hard time
drilling it out you might have a very dull bit. I have a Drill Doctor
bit sharpener; great tool.
John
At 11:33 PM 2/5/2012 +0000, you wrote:
>Hi,
>
>Going back to the original questions....
>
>It seems that I'll have to drill the plug out of my manifold. The plug is
>not brass sadly; if it were, it probably wouldn't have welded itself in? Nor
>would it be such a brute to drill out.
>
>Does anyone know what size the thread is? 3/8in is mentioned for the twin
>carb models, but mine's a tricarb and, of course, I don't have, say, a BJ7
>lying around with which to make a comparison.
>
>And, to repeat a previous question, does anyone know if the plug is solid
>or, hopefully, hollow?
>
>Thanks,
>
>Simon
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