ICON Premium Forged Big Block Chrysler 440 "RB" 511ci Pistons Step Dish Top 4.375" Bore

Name: ICON Premium Forged Big Block Chrysler 440 "RB" 511ci Pistons Step Dish Top 4.375" Bore
Brand: UNITED ENGINE MACHINE
SKU: 648-IC842.055
Price: 740.59 USD
Availability: InStock

^$740⁵⁹

Ships on 09/14/2026

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Chrysler "RB" 505ci

Step Dish Top Pistons

Use w/ 7.100" Connecting Rods & 4.250" Crank Stroke

Big Block Chrysler "RB" 511ci Forged Pistons

Step Dish Top

4.375" Bore (+.055'')

7.100" Connecting Rod

4.250" Crank Stroke

Comp. Ratio: 10.3:1 / 75cc; 10.0:1 / 78cc; 9.3:1 / 88cc

8/pkg.

Technical Notes:

For use with 440 "RB" blocks
Stock standard 440 cylinder bore is 4.320" with 3.750" crankshaft stroke
4.375" Bore + 4.250 Stroke = 511ci

Technical Specs:

Alloy: Premium High Ductility 2618
Bore: 4.375"
Crankshaft Stroke: 4.250"
Connecting Rod Length: 7.100"
Deck Height: 10.725" (RB)
Compression Height: 1.485'
Pin Size: 0.9900' x 2.750"
Pin Location: Centered
Flat Top: 2 Valve Reliefs
Effective Head Volume: 26.7cc
Intake Valve Relief: 0.215" Depth / 2.300" Diameter
Exhaust Valve Relief: 0.194" Depth / 1.880" Diameter
Top Landing Height: 0.320"
Ring Grooves: 1/16" Top; 1/16" Middle; 3/16" Bottom
Gram Weight: 592/141
Compression Ratio: 10.3:1 w/75cc Heads; 10.0:1 w/78cc Heads; 9.3:1 w/88cc

United Engine and Machine Company is proud to introduce their new Icon line of forged pistons. Icon brings the same quality and performance you've come to expect from other United Engine brands while adding a new lightweight forged design. No matter your high performance application, there is an Icon piston for you.

Features:

High ductility 2618 alloy
Perfect for Nitrous, Turbocharged and Supercharged Apps
Dual forced pin oiling on most applications

Lateral gas porting on higher compression ratios
Fully machined with deep valve pockets
Second land accumulator grooves
Top land mini groove technology
Diamond finished skirts
Triple wound spiral locks
Spacer rings included in short compression heights that intersect the wrist pin bore

Part TypePiston

Product LineUEM Pistons Icon Premium Forged Series Big Block Chrysler Pistons

BrandUNITED ENGINE MACHINE

Part CategoryPerformance Parts

Part FitmentSemi Universal

Vendor Part NumberIC842.055

Package Qty1

Package TypeEA

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