Yes, you can bore just one side. Boring one side is virtually undetectable.

No. Modern pistons, particularly forged pistons, are internally lightened to compensate for the larger diameter.

No, when bored properly your engine will run no hotter than it does stock.

No, do not mix extra oil with your gas. Adding extra oil can cause the piston to run hotter during break-in, excess carbon to accumulate and the cylinder walls to glaze and the rings may not seal properly if at all.

A cast piston is liquid molten aluminum poured or injected into a mold. A forged piston is made from a solid ingot and pressed or extruded into shape before machining.

A forged piston, specifically Wiseco pistons. 1- Cast pistons are brittle and often shatter causing catastrophic engine damage. Forged pistons are stronger to a much higher temperature than a cast piston could endure. 2- Forged pistons dissapate heat better and run cooler than cast pistons. 3- Forged pistons are a hi-silicon, low expansion aluminum alloy with improved cam and taper grind from computerized machining, that controls expansion to allow tighter pistonto wall clearances. This increases piston stability and maximizes horsepower. 4- A forged piston is also lighter than a cast piston because less material is needed to manufacture a strong and dependable forged piston.