HHmmm..... interesting attitudes from both Caddy and Pat. I like that Pat mention the ill-equipped foriegn cranks and the effort to lighten and balance. On the other hand, not worrying about the correct geometry has red flags going off. Let me present a question of good measure, why would you not consider rod to stroke ratios, dwell time, combustion burn time, and flame travel created by a combo when building a strong runner and reliable powerplant? Another thought would be, why should I not or any other builder not be concerened with a reciprocating mass of a dimension that can achieve more effort by lightening the assembly and transferring te work load to the ground? Good food for thought for those who wish to build a stout power plant.