Your advice is that the 170 and QB blocks are best left to their own crankcases than fit to Century cases. ( they don't fit?)
However, what is the bearing weakness in the 170 - is it weaker than the Century? I presume the QB crank and rod is different to the 170?
Its very difficult to compare anything with the QB, they are not so plentiful!
Interchangability thread
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rosbullterier
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