Thread: Anyone have a good way of blocking the exhaust crossover ports on FE390 Heads

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So Stotzbotz,
Seems to me that if you have the right intake gaskets, and if the intake to head to valley interface is correct (block decked or heads milled requires adjustment of the intake mating surfaces, or the "china wall" for proper spacing) you'd be better off leaving the crossover ports functional, to improve cold/cool weather driveability, and quicker warmups in cold weather. Now given your Tallahassee location you may not be concerned with cool weather, but I'd still consider leaving the passages functional. There's no reason for your smoke to be due to those ports if your gaskets are sealing right.

The ports on the heads are shaped differently from the ports on the intake and the Felpro gaskets have no holes in them for ports nor do they have any metal plates built into the gaskets to help with sealing these off. I've made 2 covers for these port holes out of very thin metal that will block them completely. The gaskets will lay directly over them and the new Edelbrock performer will seal the deal.