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ROTATING ASSEMBLY KIT-BBC 555 4.250/4.560 43cc D
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Estimated Ship Date: Dec 22, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
29555HXX
Part Type:
Product Line:
Summit Racing Part Number:
MAN-29555HXX
Item Number:
3726774
UPC:
807298087429
Actual Engine Displacement:
9.1L/555
Rear Main Seal Style:
2-piece
Bore (in.):
4.560 in.
Bore (mm):
115.824mm
Engine Stroke (in.):
4.250 in.
Balanced:
Yes
Piston Material:
Forged aluminum
Piston Style:
Dome, with two valve reliefs
Harmonic Balancer Included:
No
Flexplate Included:
No
Flywheel Included:
No
Pistons Included:
Yes
Piston Head Volume (cc):
+43.00cc
Wrist Pin Style:
Floating
Piston Rings Included:
Yes
Piston Ring Facing Material:
Plasmamoly
Piston and Ring Oversize (in.):
0.060 in.
Piston and Ring Oversize (mm):
1.520mm
Crankshaft Included:
Yes
Crankshaft Material:
Forged 4340 steel
Engine Balance:
Internal
Connecting Rods Included:
Yes
Connecting Rod Length Center to Center (in.):
6.385 in.
Connecting Rod Material:
Forged 4340 steel
Connecting Rod Beam Style:
H-beam
Rod Bearings Included:
Yes
Rod Bearing Undersize (in.):
Stock
Rod Bearing Undersize (mm):
Stock
Main Bearings Included:
Yes
Main Bearing Undersize (in.):
Stock
Main Bearing Undersize (mm):
Stock
Cam Bearings Included:
No
Gaskets Included:
No
Oil Pump Included:
No
Camshaft Included:
No
Lifters Included:
No
Timing Chain and Gears Included:
No
Plastigage Included:
No
Assembly Lubricant Included:
No
Quantity:
Sold as a kit.
Notes:
For standard deck block. Comes with HX series main bearings, and X series rod bearings. Comes without center counterweights.
Manley Rotating Assemblies
When it comes to building horsepower and torque, you need to start at the bottom and work your way up. Manley rotating assemblies are designed for performance enthusiasts wanting to get the most out of their engines. Their assemblies feature 4340 forged steel crankshaft and H-beam connecting rods, either 7/16 in. ARP 8740 cap screws with a 750 hp rating for LS engines/900 hp for big blocks, or optional ARP 2000 cap screws for up to 1,500 hp. They use 2618 Platinum Series forged aluminum pistons, chromoly premium wrist pins, Total Seal piston rings, and Clevite "H" Series narrowed rods and "P" or "H" Series main engine bearings. Building high-horsepower performance engines takes a lot of thought and all the right parts. Start off right with Manley rotating assemblies.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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