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Icon Forged -4.5cc Flat Top Pistons, 400, 3.75" Str, 

IC890-030, IC890-040, IC890-060

Flat Top
2618 Forged Aluminum
6.625" Rod Length
1/16", 1/16", 3/16" Ring Size
-4.50cc Valve Pocket
Press-fit or floating
.980 Pin
.030 Over- 4.150" Bore- IC890-030
.040 Over- 4.160" Bore- IC890-040
.060 Over- 4.180" Bore- IC890-060

Pricing: $649.95

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These Icon pistons feature a diamond-machined skirt, head, mini-grooves, pin bore, gas accumulator, ring grooves, and pressure-drilled pin hole oiling. They have a V-rib design for light weight, strength, and maximum piston cooling.

Icon Line of Forged Pontiac Pistons by Keith Black use a high quality forging that results in a much lighter piston than the Federal Mogul/TRW. The pin is also quite a bit lighter than the TRW. These pistons come with pin locks so they can be used with BUSHED or PRESS-FIT rods.

Image may not represent actual product.


Stock Bore: 4.120 Rod Length: 6.630 Pin Diameter: 0.9805
Stroke: 3.750 Comp. Ht: 1.720 Top Land: 0.250
Minimum Clearance   OE Deck Height: 10.250 Weight Piston/Pin: 558/163
Head Type Flat Top Effective Head Volume 4.5cc
Ext. Valve Depth 0.206 Ext. Valve Dia. 1.780
Int. Relief Depth 0.210 Int. Relief Dia. 2.330

Compression Ratios




Pin Number


Lock Ring



Centered pin.  use OE or Edelbrock style heads.  Some stock rods may need to be narrowed and balance pad removed.


  • UEM-IC-890
  • UEM-IC-890
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Shipping Information

  • Item Requires Shipping
  • 16.0 lbs.

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