I picked up my finished 6G72 heads today and paid the damages. $487! Ouch!

They have around 170K on them and were pulled for the first time. They pressure checked OK, heads were resurfaced, valves and seats ground (three angle). Of course the stem seals were bad. The surprise was that the guides were ALL bad. Some were even cracked. So that's where the extra cost came in. They pressed in new guides and cleaned both heads very well.

Looks like Bearing Service company does good work (for those of you in the Portland area). Time will tell... I forgot to ask them where they get the new guides and seals from. I don't know if they have to buy that stuff from Mitsu or if there are aftermarket suppliers?

I was going to clean up the ports a little before sending them off, but frankly, there's nothing to clean up. Port openings match intake and exhaust very well. No casting flash in the ports, bowls and transitions are already very smooth and nicely contoured. Even the guide and surrounding metal have a good shape. I don't think there is much to be gained porting these heads.