Originally Posted by chevy82
It can be saved if done right. I would try a heli-coil repair or gm has a thread repair kit that comes with timeserts (Dealer item only) . I would try this first before replacing the head, but to each his own though.
Timesert makes two kits for GM 3100/3400 V6. A 10mm & a 8mm bolt thread kit. My 99 Chevy Lumina 3100 Vin M used 10mm rocker arm bolts. Google the Thread Doctor. Lisle makes an upgraded pushrod removal tool part# 48300. The only correct way to loosen the rocker arm bolts on these GM 60* V6 without using the fore mentioned tool, is to turn the crankshaft in order to make sure each cylinders valves are not being opened, or at TDC on the compression stroke. The reason is that if the cam is trying to open the valves, then the rocker arm bolts threads in the aluminum head are in tension....... High loading, thus you strip out the threads in the head, when they are loosened. Youtube is replete with videos of knocking 3100/3400 engines.