Believe what you want !!! You should have seen the exhaust valves that came out of my 1970 350 v/8. Allthough it was used to pull a 22 ft. travel trailer all over the USA. Looked like someone tryed to be beat them out of the head the wrong way. The seats were beat flat and the valves junk.I didn't know if it was the seat or the valves that caused this (the old chicken or egg thing). I just replace both. The intake valves were just fine. Now the other side of the story...I drove my old 216 Chevy around 10,000 miles on unleaded gas with no ill effect.Like John said I think it,s the type of service you intend to use your motor for that will help you decide if you want to replace the seats...SCRAP
