12-14 ° solid dome & 24 ° conventional head designs 4.630 ” bore size now shelf-stocked 100 % USA made Custom-level features on every Professional Series piston ArmorGlide skirt coating for improved wear resistance Vertical gas ports for enhanced top ring seal Anti-detonation grooves to prevent carbon buildup Undercrown milling to reduce weight in non-critical areas Available now to fit many industry-leading head combinations

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