[KULTULZ]

I’ll add that without the hardened seats, valve guide wear increases significantly which ends up just costing more in the long run. If it’s a vehicle that’s just being driven 2500 miles a year or less, then the cost of hardened seats my not be justified depending upon your budget. 70K miles on unleaded fuel without hardened seats seems to be the record here with 35-40K miles being the average where the heads must be pulled again and worked on. At that point, most customers simply opt to go with the hardened seats and never look at the inside of their engines again.

TED EATON - http://forums.y-blocksforever.com/Topic31944.aspx