dogdays,

line boring and line honing are two different operations. line boring uses a carbide bit that is mounted on a shaft that can traverse the entire length of the block front to back. this too is supported at both ends to maintain concentricity and straightness of the bore that its supposed to put it. the carbide bit is designed to remove alot of metal and in the case of main caps and or blocks that are as cast you start the opertation with a line bore.

Line honing is an operation where you use stones mounted on a shaft that is supported on either end. this operation removes a small amount of material and is done to set the size of the bore to fit your bearings.

if your caps are close to the final size and just need to be opened up you will hone them. if your replacing caps or starting from a rough casting like most race blocks then you will line bore and then line hone.