[-=Jeff=-]

Originally Posted by WARP TEN

OK Al, I'll bite: What are gas ports on the pistons? Those tiny little holes around the perimeters? And what exactly is their purpose? Inquiring minds want to know....-Bob

Yes Bob.. I stumbled across this:

a gas port is a hole drilled from the piston deck (a vertical gas port) or from the top ring land (a horizontal gas port) to the rear of the top ring groove. The purpose of a gas port is to apply combustion pressure directly to the top ring, forcing the ring face firmly against the cylinder wall. The number, size, and location of gas ports vary with bore diameter, engine type, dome design, and the engine builder’s personal preferences.

Here is a link:
http://rehermorrison.com/tech-talk-2...-of-gas-ports/