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![1001177 Racetec Forged Flat Top Piston Set for GM Gen IV LS7 12-Degree Extreme Duty FSR Engines [4.125 in. Bore]](https://www.jegs.com/images/mini_750/600/613/613-1001177.jpg)
Vehicle Info NeededRACETEC PISTONSPART NUMBER: 613-1001177
1001177 Racetec Forged Flat Top Piston Set for GM Gen IV LS7 12-Degree Extreme Duty FSR Engines [4.125 in. Bore]
$98730$1097.00You Save$109.70
Ships on 10/12/2026
Lowest Price GuaranteeRacetec Forged Piston SetGM Gen IV LS7 12-Degree Extreme Duty FSR 4.125 in. Bore Forged 2618 Aluminum 4.125 in. Stroke 6.125 in. Rod Length 1.052 in. Compression Height -4.3 cc Crown Volume 1.5 x 1.5 x 3.0 mm Ring Grooves Set
RaceTec 1001177 RaceTec Flat Top Piston Set Specs:
- Engine Family: GM Gen IV LS7 12-Degree Extreme Duty FSR
- Bore: 4.125 in.
- Stroke: 4.125 in.
- Rod Length: 6.125 in.
- Compression Height: 1.052 in.
- Crown Volume: -4.3 cc
- Piston Style: Flat Top w/2 Valve Reliefs
- Alloy: 2618
- Wrist Pin Diameter: 0.927 in.
- Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil
RaceTec 1001177 RaceTec Flat Top Piston Set Notes:
- Requires RaceTec AT 4130 Ring Set or Equivalent (Sold Separately)
- Includes oil rail supports
RaceTec Series Pistons For Chevy Applications: Ultimate 2618 Alloy Strength For High-Horsepower Builds
RaceTec Series Pistons represent the highest level of precision-engineered performance, manufactured from forged or billet 2618 aluminum alloy for extreme durability and strength. Designed using advanced CAD technology and modern CNC machining, these pistons feature diamond-turned ring grooves and skirts for superior sealing, reduced friction, and consistent performance under high horsepower demands. The RaceTec Series provides proven reliability for everything from shelf applications with mild nitrous or boost to fully custom Top Fuel, vintage racing, and extreme power builds.
Part TypePiston
Product LineRaceTec Series Pistons for Chevy
BrandRACETEC PISTONS
Package Height6.0
Package Width12.0
Package Length12.0
Weight12.0 PG
Part CategoryPerformance Parts
Pin Lock Rings IncludedYes
Compression Height (In)1.052
Bore (In)4.125
Wrist Pin StylePress or Full Floating
QuantitySet of 8
Piston Head Volume-4.3
Engine Make/SizeGM Gen III/IV LS
Piston StyleFlat Top
Ring Thickness1.5 x 1.5 x 3.0 mm
Piston Material2618
Pin Diameter (In)0.927
Part FitmentSemi Universal
Wrist Pin IncludedYes
Snap Rings IncludedYes
Vendor Part Number1001177
Package Qty1
Package TypeEA
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