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Egge makes 3 5/16 + .020,.030 . Pistons for just this reason. I'm using a set of the 20 over pistons in my truck. I saved a 276 , and now have a 279.4 ci engine which i call the 280 for short. I put the engine back to stock. EAB cam and heads with 2GC carb on Bored out Merc intake and a SBC dist. Engine torque is unbelievable, climbed the Weston/Andover hill in overdrive. Went over the top at 43 mph, engine was turning 1300 rpm. Not many engines of today can do that.