jb weld on carb crack

[XeonTux]

in short:

I would like to use the quick setting JB Weld to fill a small crack in my carb. The rated temp is 300 deg F for the quick, and 500 for the standard JB Weld. Should 300 be enough? How hot does the base of the carb get?


the long version:

The 2bbl on my 351c has a small crack at the base in the center between mounting holes (but not by mounting holes). The PO bought the carb remanufactured but warranty ran up a few months ago :/ For all I know they had overtightened it.. Anyhow I am not about to buy another 2bbl and I do not want to go 4bbl yet. So JB Weld is lookin good

Correct me if I'm wrong but I think I should apply it with the carb tight on the manifold (though I will be replacing the gasket and will put some in the crack just before I reinstall it). I thought about filling the crack and placing the carb in a vice while it sets...but wouldn't it be more stressed when reinstalled and be more likely to crack again? If I do this with the carb installed I think the quick setting one is necessary. Its fscking cold out here. I can do this in a heated garage but I can't plan on leaving the car in there for over 4 hours.



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crack here------^
viewed from driver side fender

 

[10secgoal]

Well since it seems aparent that you going to try it. I would try to seal when it was on the car. That way it has the same load if you will. Get new gaskets for the base and put the nut on hand tight with only your fingers. That's all it needs. The vacuum from the motor will seal it it up and it will keep you from over tightening and possibly cracking it somewhere else.

 

[1969mach1351]

I've used standard on the fuel bowl before, it worked fine. You might tighten it down while the JB is setting?

 

[allcarfan]

PS: the bottom of a carb doesnt get close to 300 degrees