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Manley 290730RH SBC Rotating Assembly Stroke Bore Flat Top - 355 3.480 4.030 4cc

Manufacturer

Picture for manufacturer Manley

Part Number

290730RH
8 reviews
Sale Price

$3,050.18

Estimated ship date Thursday, November 19

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Product Details

The Manley 290730RH is a complete rotating assembly engineered for high-performance Small Block Chevy (SBC) 355 cubic inch builds. Featuring a 3.480" stroke and a 4.030" bore (+.030" oversize), this kit is designed for use with a standard 350 engine block and 350 main journal diameters. The "RH" suffix denotes that this assembly is configured with ARP 2000 rod bolts and Clevite HX-Series main bearings with .001" extra clearance — ideal for demanding, high-horsepower applications.

Key Features:

  • 4340 Forged Steel Crankshaft — heat treated, stress relieved, shot peened, nitrided, and 100% magnafluxed with micro-polished large-radius journals
  • H-Beam Connecting Rods — 6.000" rod length with 7/16" ARP 2000 cap screws rated up to 1,500 hp
  • 2618 Platinum Series Forged Aluminum Pistons — -4cc flat top design; compression height 1.250"; piston and pin weight 510 grams
  • Premium Chrome Moly Wrist Pins included with pistons
  • Total Seal Piston Rings — 1/16", 1/16", 3/16" ring package
  • Clevite HX-Series Main Bearings — .001" extra clearance for high-performance applications
  • Clevite H-Series Narrowed Rod Bearings
  • Compression ratio: approximately 11.2:1 with 58cc heads, 10.4:1 with 64cc, or 9.1:1 with 76cc combustion chambers

This rotating assembly is the foundation of a serious high-horsepower SBC build, delivering a proven combination of forged components, precision engineering, and race-proven hardware capable of supporting up to 1,500 horsepower with the included ARP 2000 fasteners.

Was bothered about the shipment coming with a lot of damage to the box and it had foot prints all over it. I reached out with concern and was told I could return it but will be charged to restock/service. This is uncool considering the condition it arrived in from the warehouse or etc.

Easy check out. Literally the best check out payment experience I've ever experienced.

Great price, fast shipping!

Quick and easy

Great and speedy service everytime I order.

Excellent experience

I had no issues with my order or customer service. They responded to my email promptly.

Easy, no nonsense online ordering.

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