1000945 RaceTec Forged Dome Piston Set for GM Gen III/IV LS 15-Degree Extreme Duty FSR Engines [4.065 in. Bore]

Name: 1000945 RaceTec Forged Dome Piston Set for GM Gen III/IV LS 15-Degree Extreme Duty FSR Engines [4.065 in. Bore]
Brand: RACETEC PISTONS
SKU: 613-1000945
Price: 987.30 USD
Availability: InStock

^$987³⁰$1097.00You Save$109.70

Ships on 10/12/2026

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RaceTec Forged Piston Set

GM Gen III/IV LS 15-Degree Extreme Duty FSR

4.065 in. Bore

Forged 2618 Aluminum

4 in. Stroke

6.125 in. Rod Length

1.115 in. Compression Height

3.1 cc Crown Volume

1.5 x 1.5 x 3.0 mm RG

Set of 8

Racetec 1000945 RaceTec Dome Piston Set Features:

Manufactured on 2618 material forgings with light weight in mind
CNC Precision used in every manufacturing operation
Valve pockets machined for oversized valves and high lift cams
Critically machined super flat ring grooves for 1.5mm, 1.5mm, 3.0mm rings
Top ring land gas distribution grooves to enhance performance and improve ring seal
927-2250-51-18C Heavy Duty Chromoly wrist pins, pin fit, wire locks, broached double pin oilers, and accumulator groove are included at no extra charge
Diamond tooling used throughout production including ring grooves and skirts, for unrivaled tolerance control and finish
Dyno tested and race track proven designs

RaceTec 1000945 Racetec Dome Piston Set Specs:

Engine Family: 15-Degree GM Gen III/IV LS Extreme Duty FSR
Displacement reference: 376 cu. in. (6.2L)
Bore: 4.065 in.
Stroke: 4 in.
Rod Length: 6.125 in.
Compression Height: 1.115 in.
Crown Volume: 3.1 cc
Piston Style: Dome
Alloy: 2618
Wrist Pin Diameter: 0.927 in.
Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

RaceTec 1000945 RaceTec Dome Piston Set Notes:

Requires RaceTec AT 4065 Ring Set or Equivalent (Sold Separately)
Compression Ratios:
- 13.2 @ w/64 cc Heads
- 12.5 @ w/68 cc Heads
- 12.2 @ w/70 cc Heads
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)1.115

Bore (In)4.065

Wrist Pin StylePress or Full Floating