Join Date: Aug 1998
Location: Waldorf Md. USA
How much do you drive the car ?? If it is just a weekend, fun type car, you probably do not have to worry about it at all. Just run the unleaded fuel. We have found that as long as a motor has been run for a while with leaded fuel, the lead seems to form a coating on the valves and seats. Also the seats tend to "work" harden after a while. As long as you are not using the car for a daily driver, the motor will probably run for quite a few years without any problems.
My 71 Chevelle has had nothing but Amoco unleaded high test in it since the day I purchased it new in August of 1971...never had a problem with valve seats, then or now. Same deal with my 73 Z-28 which my brother bought new in 73. The heads have never been off and I use unleaded Amoco 93 octane. Drive it about 3000 miles a year. Granted, the 73 might have come from the factory with hardened seats, thats right about when they started using them.
I know this goes against what a lot of people say, but to be honest with you we see more valve seats killed on the newer "smog" motors than anything else. Rarely see one on an old motor, and we do heads all day !
I say forget the lead replacement and drive it.
Hope this helps,
Advanced Automotive Machine