[Keithc8]

When it comes to camshaft design several things have to be considered and I am not sure we can get into all of them. In most cases you will see a larger exhaust duration than intake duration. This even becomes more common on larger cubic inch engines and as the rpm goes up. This does depend on the head and flow as well. There are very few cases where an engine will not benefit from a larger exhaust duration camshaft. We will run more lift a lot of times on the intake than the exhaust. The stock small block Chevy head in some cases is the one head that will run the same duration or even more on the intake side because the exhaust was so good and the engines had a real restricted intake as well. It is not uncommom to run between 8 to 12 degrees more exhaust duration on the exhaust of a FE engine. Good luck, Keith Craft