4BD1T stripped threads

[grnrvrs]

In preparation for installing the clutch and getting the motor back in the chassis, I was checking the torque of the flywheel housing to block bolts. Two of the bolts have mangled threads while the threads in the block for the third stripped. I'm concerned about the stripped threads in the block. In pic 1, the two bolts on the left are mangled. The bolt on the right and pictured in pic 2 correspond to the stripped threads in the block. The offending threads are the lower left location in pic3.

Is a helicoil a viable repair for the block? I appreciate any help.

[c.h.i.e.f]

I would say yes helicoil would be suitable but firstly I would run a tap down holes then screw the bolts in and see what the distance is between the underside of the bolt head is to the block and then measure the thickness of the flywheel housing just incase the bolts are to long and previous owner decided to get a rattle gun onto them...

[Blknight.aus]

depth gauge them, then drill and helicoil. use the longest helicoils that are available.

helicoils commonly come in 3 sizes D, 1.5D and 2D which is depth=diameter, 1..5 Times the diameter and 2 times the diameter.