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Icon Forged Pistons, Pontiac 400, Flat Top (-4.5cc), .030" Over (Set/8) UEM-IC-890-030-8

IC890-030, IC890-040, IC890-060

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UEM-IC-890-030-8

ICON Forged Pistons — Set of 8
Pontiac 400
-4.5cc Flat Top
4.150" Bore (+.030")
3.750" Stroke
1.720" Compression Height
.980" x 3.000" Pins Included
1/16, 1/16, 3/16 Ring Pack (rings sold separately)

Pricing: $733.47

Qty:

Description

ICON Pistons — Pontiac 400

4.150" Bore (+.030") · 3.750" Stroke · -4.5cc Flat Top · Set of 8

ICON pistons are forged 2618-equivalent premium alloy from United Engine & Machine, the same shop that builds Keith Black. They are the value-forged answer for a Pontiac that has outgrown a cast or hypereutectic piston — a healthy hydraulic roller street engine, a bracket car, or any build where detonation and heat are a real possibility.

Specifications

Part NumberUEM-IC-890-030-8
BrandICON
Material2618-equivalent forged aluminum
ApplicationPontiac 400
Oversize+.030"
Finished Bore4.150"
Stroke3.750"
Rod Length6.625"
Compression Height1.720"
OE Deck Height10.240"
CrownFlat Top, -4.5cc valve pockets
Pin Diameter.980"
Pin Length3.000"
Pin TypePress-fit or floating, centered
Lock RingPRH107-3
Top Land.250"
Intake Valve Relief (depth / dia.).210" / 2.330"
Exhaust Valve Relief (depth / dia.).206" / 1.780"
Weight, Piston / Pin (grams)558 / 163
Compression Ratio (chamber cc - ratio)71cc-10.9, 87cc-9.3, 96cc-8.6
Ring Pack1/16, 1/16, 3/16 (sold separately)
QuantitySet of 8

What You Get

  • Eight ICON forged pistons
  • .980" x 3.000" wrist pins and locks

Fitment & Installation Notes

  • Eagle and Scat bushed rods may require honing to fit the pin.
  • Some stock rods may need to be narrowed and the balance pad removed.
  • Use OE or Edelbrock style heads.

Before you order: measure your finished bore before buying an oversize. Confirm chamber volume and deck height against your target compression ratio — crown volume alone does not set compression. Opened or installed pistons are not returnable.

Butler Tech Library
Picking the Right Piston for Your Compression Target
Cast vs. forged, flat-top vs. dish vs. dome, and compression height — our piston guide covers how Butler dishes in-house to hit your target with any Pontiac head. Run the numbers with our compression calculator.
Read the Piston Guide ›

Specifications/Information

Part NumberUEM-IC-890-030-8
BrandICON
Material2618-equivalent forged aluminum
ApplicationPontiac 400
Oversize+.030"
Finished Bore4.150"
Stroke3.750"
Rod Length6.625"
Compression Height1.720"
OE Deck Height10.240"
CrownFlat Top, -4.5cc valve pockets
Pin Diameter.980"
Pin Length3.000"
Pin TypePress-fit or floating, centered
Lock RingPRH107-3
Top Land.250"
Intake Valve Relief (depth / dia.).210" / 2.330"
Exhaust Valve Relief (depth / dia.).206" / 1.780"
Weight, Piston / Pin (grams)558 / 163
Compression Ratio (chamber cc - ratio)71cc-10.9, 87cc-9.3, 96cc-8.6
Ring Pack1/16, 1/16, 3/16 (sold separately)
QuantitySet of 8

Notes

  • Eagle and Scat bushed rods may require honing to fit the pin.
  • Some stock rods may need to be narrowed and the balance pad removed.
  • Use OE or Edelbrock style heads.

Details

  • UEM-IC-890-030-8
  • UEM-IC-890-030-8
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Shipping Information

  • Item Requires Shipping
  • 16.0 lbs.

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