Jeep Pentastar specs: 3.78 x 3.268 in (96 x 83 mm) bore and stroke, shared by all 5 versions. Displacement, compression and factory ratings, plus rod ratio.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.