273 Exh Port MisMatch

Very interesting. I never read that many factory engines had no exhaust manifold gaskets. Every one I've taken off had a gasket, but someone might have been "in there" before me.

Is it true that we don't need those metal heat shields now that spark plug boots and wires are silicone instead of the older rubber (nitrile, i.e. Buna-N?). On my 1965 383 engine, the heat shields are secured under the outer head bolts and get in the way when pulling off the plug wires. My 1965 273 doesn't have heat shields and I don't have any old ones.