Originally Posted by Chad.
I went and measured the bores they come in slightly under 4.030 at 4.0285 as for pistons forged ones are not required. Building a street engine around 400hp so hypereutectic pistons will do.
You can look at the finish of the bores and tell if they've been final honed or have only been bored in most cases. If there's no indications of the final hone being done (finish quality and crosshatch), it has to be done in order for the bores to be sized correctly and to allow the rings to break in.
You may find you need to have the final hone (re?)done to fit the pistons to the bores. You'd expect to see a 0.030" overbore for a 0.030" piston, the clearances being provided by the piston OD, as mentioned previously.