The block casing is the same; gsr, ctr, itr, it is all the exact same casing including the sleeves. Crank on an itr is counterweighted better for high rpms, itr rods are a little lighter but no big deal, and obviously the pistons are different.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.