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Icon Pistons - LS 5.3L Ft Forged Piston Set 3.780 Bore

Icon Pistons - LS 5.3L Ft Forged Piston Set 3.780 Bore

High-performance forged piston set designed for GM LS 4.8L and 5.3L engines, featuring a 3.780-inch bore and flat top design with a -2.9cc volume.
$ 496.43 $ 496.43

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Specification

Brand
Icon Pistons
Item Number
ICNIC9986C.STD
Part Name
LS 5.3L Ft Forged Piston Set 3.780 Bore
Bore Size
3.780 inches
Stroke
3.622 inches
Rod Length
6.125 inches
Compression Height
1.304 inches
Piston Material
Forged 4032 Alloy
Piston Type
Flat Top
Crown Volume
-2.9 cc
Compression Ratio
9.8:1 with 64.5cc chambers; 9.1:1 with 68.4cc chambers
Ring Groove Sizes
1.5mm x 1.5mm x 3.0mm
Wrist Pin Diameter
0.927 inches
Wrist Pin Included
Yes
Rings Included
No
Application
GM LS 4.8L and 5.3L engines
Set Quantity
8 pistons
Skirt Coating
M42 Skirt Coating Standard
Valve Reliefs
2
Top Land Thickness
0.275 inches
Accumulator Groove
Yes
Skirt and Pin Boss Struts
Designed to withstand heavy loads from high cylinder pressures
Crown and Valve Reliefs
CNC machined
Top Land Mini Groove Technology
Yes
Skirts Machined
By UEM's unique in-house built CNC machines
Advertised Piston Weight
427 grams
Wrist Pin Weight
121 grams

Description

The Icon Pistons LS 5.3L FT Forged Piston Set is engineered for GM LS 4.8L and 5.3L engines, offering a 3.780-inch bore and flat top design with a -2.9cc volume. Crafted from 4032 alloy, these pistons provide enhanced durability and reduced thermal expansion, making them ideal for street and mild boosted applications. Features include CNC-machined crown and valve reliefs, top land mini groove technology, and an accumulator groove to maximize ring seal. The set includes wrist pins and spiral locks; rings are sold separately. Compression ratios are 9.8:1 with 64.5cc chambers and 9.1:1 with 68.4cc chambers. ([cnc-motorsports.com](https://cnc-motorsports.com/icon-pistons-ic9986c-std-gm-ls-fhr-coated-flat-top-2-9cc-bore-3-780.html?utm_source=openai))

Disclaimer

This product can expose you to chemicals known to the State of California to cause cancer. Please contact us to obtain a list of harmful chemicals. For more information, visit www.P65Warnings.ca.gov. ([cnc-motorsports.com](https://cnc-motorsports.com/icon-pistons-ic9986c-std-gm-ls-fhr-coated-flat-top-2-9cc-bore-3-780.html?utm_source=openai))