[BarryGMC]

I do all my own head work, and here is what I do. I grind the valves and seats and stems. I check the guides and if they are only a little out I knurl the guides. If they are way out I check another head. If thats no good I put in new guides. If I have a bad valve or 2 I go to the parts pile and find another valve to grind. same with the springs, check the tension. On the v6 I check the rocker shaft and rockers. I put it all together with new seals on the intake valves, Same as chevy smallblock. There are no seals on the exhaust. These are the little O rings in a head set. Here is were I will dissagree with most shops I have never seen seat erosion on a gmc v6 so I dont put in hardened seats if the heads dont have them. The incredible cooling around the valves and high nickle fine grain cast iron seem to go a long way in preventing erosion. Finally dont touch the lifters unless the cam is bad, and only replace the pushrods if there is galling or any unusual wear on the ends.