Stripped thread in engine block

Hey guys, so after removing my clutches and the rear cvt cover for cleaning and doing snorkel extentions I was installing the rear cover to the engine and broke 2 of the bolts. The first one I tried to fix with a helicoil which didn’t hold worth a damn(also don’t think the tap was able to go in far enough) and the second bolt I haven’t tried anythin yet, waiting to find someone that might have some ideas. Just wondering if I should drill them and tap them for a size bigger or if I should try helicoiling them again’t and just jb weld the frigin things in! Also how could I tap the threads to get down to the bottom of the hole? All taps I’ve seen are tappered and don’t cut the entire way down.

Stripped thread in engine block

Hey guys, so after removing my clutches and the rear cvt cover for cleaning and doing snorkel extentions I was installing the rear cover to the engine and broke 2 of the bolts. The first one I tried to fix with a helicoil which didn’t hold worth a damn(also don’t think the tap was able to go in far enough) and the second bolt I haven’t tried anythin yet, waiting to find someone that might have some ideas. Just wondering if I should drill them and tap them for a size bigger or if I should try helicoiling them again’t and just jb weld the frigin things in! Also how could I tap the threads to get down to the bottom of the hole? All taps I’ve seen are tappered and don’t cut the entire way down.