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Later engines, such as GM's Gen V and VI big-blocks, use a one-piece rear crank seal (left). The earlier Mark IV versions and its aftermarket offspring utilize a traditional two-piece setup (right).
Chevy Big-Block Engine - Big Time Power

Later engines, such as GM's Gen V and VI big-blocks, use a one-piece rear crank seal (left). The earlier Mark IV versions and its aftermarket offspring utilize a traditional two-piece setup (right).  View Related Article

 

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