I screwed up my 351W head studs, or so I thought, so I picked up some new GT40P heads, based on all the praises I read... Right after I received them, I went back and looked at the W's I had spent so much time porting. Took them over to a nearby machine shop, and all of a sudden the guy says yeah we can fix the studs for you (helicoils). My tapper skills were less than stellar/precise. Paid 200 excl. shipping. Still in boxes for $150 plus shipping from 53086. Anyone a taker? Eric