Review on 🔥 Enhance Exhaust Performance with Hedman Hedders 27500 Round Header Gasket by David Pirlet

Use these on my 350 sbc. My heads have a square port and they have round port manifold gaskets. Although they did a great job of sealing my headlines. I've heard people with square port headers actually have better luck using round port gaskets. So far, so good. The diameter of the gasket hole is slightly larger than the widest width of the square hole (i.e. none of the gaskets cover the exhaust port. But even if they did, I don't think it would be a problem since that particular part of the gasket just burns and spits out) .