I now have 127,000 miles on my 95 T-100. I was thinking about having the valves adjusted since I am the second owner and I doubt they were touched before. What kind of price should I expect to pay to have them adjusted? Is it difficult to do myself? At 127K miles, do you think the valve adjustment will make a difference in power?

ttreat
95 T-100 SR5 4x4
Pretty much stock, except for the goofy oil pressure gauge the previous owner installed.