1001690 AutoTec II Forged Dish Piston Set for GM Gen III/IV LS 15-Degree/12-Degree Engines [4.005 in. Bore]

Name: 1001690 AutoTec II Forged Dish Piston Set for GM Gen III/IV LS 15-Degree/12-Degree Engines [4.005 in. Bore]
Brand: RACETEC PISTONS
SKU: 613-1001690
Price: 879.30 USD
Availability: OutOfStock

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AutoTec II Forged Piston Set

GM Gen III/IV LS 15-Degree/12-Degree

4.005 in. Bore

Forged 2618 Aluminum

3.622 in. Stroke

6.125 in. Rod Length

1.304 in. Compression Height

-10.3 cc Crown Volume

1.5 x 1.5 x 3.0 mm RG

Set of 8

Racetec 1001690 AutoTec II Dish Piston Set Features:

Manufactured on 2618 material that will accept most mild boosted applications
CNC Precision used in every manufacturing operation
Valve pockets machined for oversized valves and high lift cams
Critically machined ring grooves for 1.5mm, 1.5mm, 3.0mm rings
Top ring land gas distribution grooves to enhance performance and improve ring seal
51 Series 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

RaceTec 1001690 Autotec II Dish Piston Set Specs:

Engine Family: 15-Degree/12-Degree GM Gen III/IV LS
Displacement reference: 365 cu. in. (6.0L)
Bore: 4.005 in.
Stroke: 3.622 in.
Rod Length: 6.125 in.
Compression Height: 1.304 in.
Crown Volume: -10.3 cc
Piston Style: Dish
Alloy: 2618
Wrist Pin Diameter: 0.927 in.
Ring Grooves: 1.5 mm Top, 1.5 mm Second, 3.0 mm Oil

RaceTec 1001690 AutoTec II Dish Piston Set Notes:

Requires RaceTec AT4005 Ring Set or Equivalent (Sold Separately)
Compression Ratios:
- 10.0:1 @ w/64 cc Heads
- 9.5:1 @ w/68 cc Heads
- 9.3:1 @ w/70 cc Heads
Will work with most 12 degree and 15 degree cylinder heads

RaceTec AutoTec II Series Pistons for Chevy Applications: High-Strength 2618 Alloy Performance For Power-Adder Builds

RaceTec AutoTec II Series Pistons are precision-manufactured from 2618 low-silicon aluminum alloy, delivering exceptional strength and durability at an extremely competitive price point. Designed using application-specific forgings and produced on the same advanced machinery as RaceTec and AutoTec lines, these pistons feature diamond-turned ring grooves and skirts for consistent performance under extreme conditions. The malleable nature of 2618 alloy makes AutoTec II pistons ideal for high-load, high-stress applications, including superchargers, turbochargers, and nitrous systems, with real-world builds exceeding 1000+ horsepower. The AutoTec II line delivers outstanding value for restorations, street performance, and spec racing engines.

Part TypePiston

Product LineRaceTec AutoTec II Series Pistons for Chevy

BrandRACETEC PISTONS

Package Height8.0

Package Width12.0

Package Length13.0

Weight12.0 PG

Part CategoryPerformance Parts

Pin Lock Rings IncludedYes

Compression Height (In)1.304

Bore (In)4.005

Wrist Pin StylePress or Full Floating