Originally Posted by marky_g
nah i wouldn't have thought so st170 is n/a focus rs is turboed
but the svt/st170 has forge rods/pistons that are made by mohle, focus rs does to, the difference between the two is mostly the head. Focus rs uses a 48cc combustion chamber and the svt/st170 uses a 40 or 42cc chamber. Sounds to me as the short blocks are the same and the heads are different.