A 4 bolt main engine has a stronger crankshaft that doesn't flex as much, the block is also stronger & will not flex as much either. This engine will have less vibration than the 2 bolt main & is better for running at higher RPMs. So, the EVO & SRT4 4 bolts are better than the GenCoupe 2 bolt, but in today's engines, the difference between the 2 is not as big a difference as in the "old school" engines. Once again, we'll just have to see what these things are capable of.
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Last edited by Tufast; 02-05-2009 at 06:35 AM.