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377 Dart block 400 mains. 4 bolt front to back. All new 223 laps ago. Just pulled pan and checked and replaced bearings, bearings still have marks in them from bore guage, and I have them. Dart aluminum heads, jesel rockers, All eagle rotating assembly, JE pistons, dynoed at willys. $6000 Engine in car can hear run 270-210-1619 if you have any questions