Ask Someone: 1970 Dodge Dart #1544201916


#1

How do you know if your vintage car needs valve seats?


#2

Brand spanking new or vintage car; the procedure for diagnosing bad valve seats is the same.

You run a dry and then wet compression test on all cylinders. If both the wet and dry test shows low compression in that cylinder, the valve seats are likely not sealing.

A leakdown test will also show bad valve seats but you need to listen at the exhaust and intake for the “hiss” of leaking valves.


#3

If your engine is running smoothly and easy to start, you don’t need valve seats. If you are worried about unleaded gas, I used to run Amoco High Test unleaded in the 60s all the time and it had no lead. There are also lead substitutes in a bottle. Unless you are using this as a daily driver I wouldn’t worry about it.