What the f#$% are you people talking about?!? I think we've got a couple conversations going on here or something.
FIRST, if the HG is blown there's no point in replacing the bolts one at a time... even if it weren't a HORRIBLE idea.... you still have to replace the damned HG and check for warpage.
SECOND, I wouldn't run a helicoil in 90% of the blocks on the market, not for the head bolt part of the equation.... there's just not enough meat in the surrounding material for me to consider it reliable after I drill the hole 3 to 4mm wider for the insert.
THIRD, Green, from what you're saying I assume you're actually talking about the manifold fastener holes (particularly the exhaust side). Two passes here is fine, on the head bolts or studs I recommend 3 or more passes at small increments but not so small that striction hits.
FOURTH, 72ft lbs for head bolts and 95 for studs... IIRC.
