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Surfacing, or square-decking, the engine block often illustrates the lack of precision on an OEM factory casting. Here the block is located off the main saddles to ensure equal dimensions from deck to deck and front to rear. Equal deck heights and equal combustion chambers will improve peak performance.
396ci Chevy Big Block - Engine-Building Tips

 Surfacing, or square-decking, the engine block often illustrates the lack of precision on an OEM factory casting. Here the block is located off the main saddles to ensure equal dimensions from deck to deck and front to rear. Equal deck heights and equal combustion chambers will improve peak performance.  View Related Article

 

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