Mopar 340 intake gasket replacement
I used Mopar black RTV on my 273 but I milled the heads and the intake to match. There wasn't much gap between the intake and china wall for a gasket. I cleaned everything, applied a bead, waited for it to set up a bit (10-15 min.), installed the intake and torqued to spec. After curing overnight, I came back and trimmed with a razor blade. The engine wasn't in the car so letting it cure before running wasn't a issue. If it was in the car I would be comfortable with letting it set overnight before running the engine.
I used Mopar black RTV on my 273 but I milled the heads and the intake to match. There wasn't much gap between the intake and china wall for a gasket. I cleaned everything, applied a bead, waited for it to set up a bit (10-15 min.), installed the intake and torqued to spec. After curing overnight, I came back and trimmed with a razor blade. The engine wasn't in the car so letting it cure before running wasn't a issue. If it was in the car I would be comfortable with letting it set overnight before running the engine.