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ICON FHR Series Pistons for GM LS
Pistons, FHR Forged, 3.903 in. Bore, Dish, 1.115 in. Compression Height, Press/Float Pin, 1.5mm x 1.5mm x 3mm Ring Grooves, Chevy, Set of 8
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Estimated Ship Date: Oct 26, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
IC9994C.005
Part Type:
Product Line:
Summit Racing Part Number:
UEM-IC9994C-005
UPC:
800745266262
Piston Rings Included:
No
Bore (in.):
3.903 in.
Bore (mm):
99.136mm
Stroke:
4.000 in.
Engine Stroke Type:
Stroked
Actual Engine Displacement:
6.3L/383
Rod Length:
6.125 in.
Piston Style:
Dish, with two valve reliefs
Piston Material:
Forged aluminum
Compression Height (in.):
1.115 in.
Piston Head Volume (cc):
+10.00cc
Wrist Pin Style:
Press-fit or floating
Wrist Pin Retainers Included:
Yes
Wrist Pin Included:
Yes
Pin Diameter (in.):
0.927 in.
Piston Ring Thickness:
1.50mm x 1.50mm x 3.00mm
File Fit:
No
Gapless:
No
Top Ring Thickness:
1.5mm
Second Ring Thickness:
1.5mm
Oil Ring Thickness:
3.0mm
Remanufactured:
No
Quantity:
Sold as a set of 8.
Notes:
Features 0.030 in. offset pin plus right- and left-bank pistons. Will fit 15-degree valve angle heads on LS1, LS6 blocks.
ICON FHR Series Pistons for GM LS
ICON FHR Series pistons for GM LS offer premium, custom options in an "off the shelf" option for your LS-family engine. FHR (Formed Head Relief) pistons have valve reliefs that are formed in as the piston blank is pressed into the die, creating a stock, but light forging. Many of the domed models are solid which allows tailoring the dome height for a specific compression ratio. They are constructed from high-strength, forged 4032 aluminum alloy for increased durability while maintaining tighter piston-to-wall clearance for increased cylinder sealing, lower cylinder wear, and stock-like noise levels, making them ideal for street and lightly boosted applications.
ICON FHR pistons for GM LS also feature:
* Mini grooves allow an overheated piston that contacts a cylinder wall to transfer heat to the wall. Friction is also reduced over a solid ring land.
* Accumulator grooves provide a reservoir area for gases that pass by the top ring. Pressure is reduced between top and second ring to help stabilize flutter and maximize ring seal.
* 0.030 in. offset wrist pins
* Round wire locks
* M42 skirt coating
Applications
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