Manley 39572X BBC Rotating Assembly Stroke Bore Dome Pistons - 572 4.250in 4.625in 43cc

The Manley 39572X is a complete Big Block Chevy 572 cubic inch rotating assembly built for serious high-performance street and racing applications. This kit combines a 4.250-inch stroke with a 4.625-inch bore and includes forged pistons featuring a +43cc dome to support high compression ratios.

At the heart of this assembly is a Manley Pro Series 4340 forged steel crankshaft, which undergoes a rigorous multi-step manufacturing process including heat treatment, stress relieving, shot peening, nitriding, and 100% magnafluxing for maximum strength and durability. The crankshaft features micro-polished large-radius journals and gun-drilled mains for reduced weight and improved oiling.

Key Features:

• Big Block Chevy 572 cubic inch rotating assembly
• 4.250-inch crankshaft stroke
• 4.625-inch bore diameter
• +43cc dome forged pistons for high compression
• Pro Series 4340 forged steel crankshaft — heat treated, stress relieved, shot peened, nitrided, and magnafluxed
• H-beam connecting rods with ARP cap screws
• High-performance piston rings included
• Clevite "H" Series rod and main bearings included
• "X" designation indicates optional X Series rod bearings with .001" extra clearance
• Factory balanced to within +/- 1% of bobweight
• Rated up to 900 hp with ARP 8740 cap screws; up to 1,500 hp with optional ARP 2000 cap screws

The 39572X suffix denotes that this assembly includes the optional X Series rod bearings with .001" extra clearance, ideal for builds requiring tighter oil film control. Designed for use in standard deck Big Block Chevy blocks, this rotating assembly delivers a reliable, performance-proven foundation for high-output street, strip, and competition engines.