What is the pupose for boring an engine. i mean is how is that going to produce more power i see it adding more air maybe but i dont know. answer this question thanks
1. It increases the engine displacement. Usually a minimal amount (a .030 overbore will increase a 351 about 6 inches) More displacement, all else equal, more power
2. You can square up the bore to the crank centerline. Decreases internal friction, applies the power to the crank not the side of the cylinder.
3. Cleans up and refinishes the cylinder. Makes the cylinder truly round and the same size top to bottom. Increase piston sealing, controls piston to cylinder clearance, etc.
4. Can cost you a block if the cylinder wall is too thin. Lost a 350 to this on a 30 overbore.