The Vortec 5.7 motors have about 10-15% better Brake Specific Fuel Consumption but you won't be getting a new one from Merc - they dropped the 5.7 from their line. If you want a 'smallish' block Merc you now have to get the 6.2l/377cid 350HP motor. I heard they have finally ironed the problems out of it and it is almost the same size as a 5.7...
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