Reply to "HARDENED VALVE SEATS"

As for fixing corrosion problems, this is the scenario- all those closed-chamber heads are now 30+ years old. Many sit in junkyards across the US, in cars with the hood open, or no hood at all, and it does rain /snow. The carb is the first thing scavenged off a wreck so this leaves the intake open to weather. At least one intake & one exhaust valve will be held open when the engine stopped for the last time, so water will fill up the cylinder. The seats rust & pit and the head is junk- unless you pop for hardened inserts.