... Superior Air Parts XP O-360 180 hp
... last winter I had it shipped to Ly-Con out in Visalia Calif.
... They ported and polished the cylinders
... then flow matched the cylinders to make this four run nearly smooth as a six.
... They replaced the 8.5:1 pistons with 10:1
... they tweeked the cam to help breathing also.
... The shop says expect 230 hp now from the original 180.