Can someone please explain what valve shrouding is and why a larger bore has less of this?

Also, what are file fit rings and why are they better than oem rings?

Gas ports? Are these in the rings or the block? How does this work?

Sorry i was reading the Tech Talk Articles of Morrison in National Dragster and learn a lot but have a lot of questions...

http://www.rehermorrison.com/techTalk/index.htm

 

Here are some hints to get you thinking:

Think of the location of the valves and their proximity to the cylinder wall.
Why would a larger bore help air flow around the valves?

End gaps can be filed to tighter tolerances. What happens if the gaps are too
big, or too tight as the engine warms up?

THese are on the pistons and vent to the rear of the ring within the groove.
If there is high combustion pressure above the piston and holes venting to
the rear of the rings, what will happen?

 

This makes much better sense now. So the airflow will be much more even with less shrouding due to the fact the air doesn't have to deal with the side of a cylinder wall.
Thx!
Funny, I always thought that piston rings encompassed the entire piston 360* with no breaks per ring.

A loss of compression? or equalization of pressure on both sides of the piston? Isn't this bad on the compression stroke, or does this only occur at a very high point in which the pressure is threatening the motor?