Rebuilt 340

The KB 107 pistons are 4.06 bore with the correct compression height to run a 3.58 stroke crank as this engine has. 340's stock have a 3.31 stroke crank and a 4.04 bore. A 0.020 overbore 340 block is a total of 4.060 bore. 360 small blocks have a stock 3.58 stroke and a 4.00 bore stock. A 0.060 360 block bore is a 4.06 total bore size.

Both engines can run this piston if using a 3.58 stroke crank.