ICON FORGED PISTONS FORD

Name: ICON FORGED PISTONS FORD
Brand: UNITED ENGINE MACHINE
SKU: 648-IC686.040
Price: 808.05 USD
Availability: InStock

^$808⁰⁵

Ships on 09/23/2026

Lowest Price Guarantee

Ford Boss 302ci

Dome Top Pistons

Solid Dome Top 6cc
4.040'' Bore (+.040'')
Use w/5.155'' Connecting Rod & 3.000'' Crank Stroke
Comp. Ratio: 12.5/52cc; 11.0/60cc; 10.5/64cc
8/pkg

Designed for factory or clone Boss 302. This piston is based and intended for use on the Windsor-based Small Block Ford with Cleveland style heads.
Technical Specs:
Alloy: Premium Forged 4032
Bore: 4.040'
Crankshaft Stroke: 3.000'
Connecting Rod Length: 5.155'
Deck Height: 8.206'
Compression Height: 1.540'
Pin Size: 0.912' x 2.750'
Pin Location: Centered
Lock Rings: PRL99-3 Spiral Locks
Dome Top: 6cc 1 Valve Relief
Intake Valve Relief: .186' Depth / 2.360' Diameter
Exhaust Valve Relief: N/A
Top Landing Height: 0.301'
Ring Grooves: 1/16' Top; 1/16' Middle; 3/16' Bottom
Gram Weight: 519/131
Compression Ratio: 12.5:1 w/52cc Heads; 11.0:1 w/60cc Heads; 10.5:1 w/64cc

Ford Small Block Windsor Based Pistons

United Engine and Machine Company is proud to introduce 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

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 Small Block Ford Pistons

BrandUNITED ENGINE MACHINE

Package Height4.9

Package Width9.5

Package Length18.9

Weight13.39 PG

Part CategoryPerformance Parts

Part FitmentSemi Universal

Vendor Part NumberIC686.040

Package Qty1

Package TypeEA