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![1000949 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_750/600/613/613-1000949.jpg)
Vehicle Info NeededRACETEC PISTONSPART NUMBER: 613-1000949
1000949 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 in. Stroke 6.077 in. Rod Length 1.163 in. Compression Height 0 cc Crown Volume 1.5 x 1.5 x 3.0 Ring Grooves Set of 8
RaceTec 1000949 RaceTec Flat Top Piston Set Specs:
- Engine Family: GM Gen IV LS7 12-Degree Extreme Duty FSR
- Bore: 4.125 in.
- Stroke: 4 in.
- Rod Length: 6.077 in.
- Compression Height: 1.163 in.
- Crown Volume: 0 cc
- Piston Style: Flat Top w/2 Valve Reliefs
- Alloy: 2618
- Wrist Pin Diameter: 0.927 in.
- Ring Grooves: 1.5 Top, 1.5 Second, 3.0 Oil
RaceTec 1000949 RaceTec Flat Top Piston Set Notes:
- Requires RaceTec RT 4125 Ring Set or Equivalent (Sold Separately)
- Includes oil rail supports
Part TypePiston
BrandRACETEC PISTONS
Package Height6.0
Package Width12.0
Package Length12.0
Weight12.0 PG
Part CategoryPerformance Parts
Pin Lock Rings IncludedYes
Compression Height (In)1.163
Bore (In)4.125
Wrist Pin StylePress or Full Floating
QuantitySet of 8
Piston Head Volume0
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 Number1000949
Package Qty1
Package TypeEA
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