That's great news - nice to hear a success story. The valves & guides tend to last a LONG time on the 60x engines, and the prechambers normally last the life of the engine. I probably would have replaced the seals, but that can be done with the head on the car if it becomes necessary in the future. I've got a trace of oil in the coolant in my new 602, with no other symptoms... pretty likely I'll be doing a head gasket job on that later this year when I have time.
