[bhieb]

This thread is very timely. I'm having my 421 tripower rebuilt and I'm looking for a way to prevent engine paint from burning off the exhaust crossover part of the intake manifold. It seems one way to do that Is to block off the exhaust crossover port, which I presume also means removing the heat riser valve from he exhaust manifold?

But is there another way? For example, has anyone had success using specialized paint, like the high temp version of POR-15 (https://por15.com/products/high-temp) perhaps as a primer, and then covering this base coat with regular engine paint? The high temp POR-15 is supposed to tolerate up to 1200 F. Anyone know how hot the exhaust crossover gets?

Brad