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Vehicle Info NeededUNITED ENGINE MACHINEPART NUMBER: 648-IC778.STD
ICON Premium Forged Big Block Chevy 454ci Piston Set 4.250" Bore
$86287
Ships on 09/09/2026
Lowest Price GuaranteeChevy 454ciDome Top Pistons Use w/6.385'' Connecting Rods
- Big Block Chevy 454ci Forged Pistons
- Hollow Dome 2V
- 4.250" Bore (STD)
- 6.385" Connecting Rod
- 4.000" Crank Stroke
- -18cc Head Volume
- Closed Chamber Design
- Comp. Ratio: 11.7/96.5cc; 9.9/115cc; 9.5/119cc
- 8/pkg
Technical Specs: - Alloy: Premium High Ductility 2618
- Bore: 4.250"
- Crankshaft Stroke: 4.000"
- Connecting Rod Length: 6.385"
- Deck Height: 9.800'
- Compression Height: 1.395'
- Pin Size: 0.990' x 2.750"
- Pin Location: Centered
- Effective Head Volume: -18cc
- Intake Valve Relief: 0.285' Depth / 2.300' Diameter
- Exhaust Valve Relief: 0.000" Depth / 0.000" Diameter
- Top Landing Height: 0.222'
- Ring Grooves: 1/16' Top; 1/16' Middle; 3/16' Bottom
- Gram Weight: 591/141
- Compression Ratio: 11.7:1 w/96.5cc Heads; 9.9:1 w/115cc Heads; 9.5:1/119cc
United Engine and Machine Company is proud to offer the 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
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- 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
- Sold in Sets (except when noted as 1 piston per package)
Click here for reference guide to piston top designs
Part TypePiston
Product LineUEM Pistons Icon Premium Forged Series Big Block Chevy Pistons
BrandUNITED ENGINE MACHINE
Package Height4.6
Package Width9.5
Package Length18.4
Weight13.82 PG
Part CategoryPerformance Parts
Part FitmentSemi Universal
Vendor Part NumberIC778.STD
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
