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while starting to disassemble the engine, i noticed that one of the head bolts came off with probably 10 lbs of twist. All others were hard. and i also noticed that this one screw had course threads and looked like it came from a hardware store!! Anyways, can i heli-coil the block threads and be alright? 86 22r
 

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91 4x4 extracab
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bolts

you are supposed to replace the head bolts when you remove the head. if someone used a standard us thread bolt in a metric hole i would get the proper tap and see if you can make the threads good by tapping them out. unless you are good at machine work i would be hesitant to heli-coil a head bolt hole.if you make a mistake with the drill you could drill into a water passage.
 
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