This spec with a 4.290 bore and a 1.094 stock pin.
Bore (in): 4.280
Stroke (in): 3.375
Rod Length (in): 6.768
Piston Material: Forged aluminum
Piston Style: Flat Top
Compression Distance (in): 1.516
Dish Volume (cc): -4.0
Pin: .990 x 2.930
Piston Ring Grooves: 1/16" x 1/16" x 3/16"
Quantity: Sold as a set of 8
So what is the problem ? Call a Diamond WD, or Diamond direct, and make it happen. 2 changes to a shelf stock piston is a small up charge, they will make it in your bore size with the big pin.
