As long as there is something on the exhaust port, you won't get fresh air into the back side of a hot exhaust valve, reducing the chances of burning said valve.
Like the exhaust manifold.
The less pressure in the pipe, the less parasitic power loss. It is harder for a 350 to push exhaust gasses through a 1 inch pipe than a 2 inch pipe. Keeping more heat inside the pipe also keeps the gasses more fluid (less resistant to flowing). That's the principle behind header tape.
A properly built header and exhaust can actually start to pull a fresh charge into the cylinder before the piston starts back down the bore. "Scavenging" but you won't get it much with a low rpm motor with a manifold.
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Today's Featured Article - A Tinker�s Guide to Manifold Repairs - by Curtis Von Fange. A common characteristic of keeping older equipment is that some parts to make repairs can be extremely difficult to locate. For example, finding a replacement for a cracked intake or exhaust manifold on a unique tractor or odd brand can be a frustrating and downright impossible mission. So, what is an alternative solution to scraping out that �one of a kind� piece of history? First, decide if you are one to try a repair yourself or have someone else do it. If you are uncomfortable about
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