to have a wiseco piston does the motor need to be bored







thanx

 

not if you get the factory bore size and the use that size to order your wiesco

 

It all has to do with the clearance between the piston and the cylinder. And how round or out of round the cylinder is.

The Weisco piston is going to be forged, forged pistons normally need more clearance than the stock pistons do. This can work for you if your cylinder is stock bore but worn evenly (still round). Then you can install the stock bore forged piston and be okay. If your cylinder is not worn and you install the forged piston it may be too tight when everything heats up and and it will gall or seize.

Bottom line - mic your cylinder, most machine shops will do this for free, then decide from there. Find the specs on the piston for your engine (Weisco prints it right on the box). [img]i/expressions/face-icon-small-smile.gif[/img]