Thanks for the reply. Just to confirm, those are stock numbers after the base gasket is removed?
Assuming you are listing duration, would the gasket make a difference?
These numbers are basically stock and you will see very little difference with or without the gasket. Most of the 55's I have worked on has b ait of a lip in the bottom of the intake port most of the time I clean that up and polish the exhaust that is about it.