I recently discovered while reassembling my intercooler tubes and supercharger top that the previous owner had repaired 3 of the 4 bolt holes for the top with heli-coils. It appears he did a poor job of it too. The heli-coils all broke apart before the bolts were even close to torque spec. The remaining holes have no thread whatsoever left. My question is whether I should attempt to use new heli-coils to repair this or if I could fill the holes with a "JB weld" type epoxy, then drill and tap them back to the original size. Has anybody performed this repair? Thanks.