1001649 AutoTec II Forged Dish Piston Set for Small Block Chevy 23-Degree Engines [4.155 in. Bore]

Name: 1001649 AutoTec II Forged Dish Piston Set for Small Block Chevy 23-Degree Engines [4.155 in. Bore]
Brand: RACETEC PISTONS
SKU: 613-1001649
Price: 879.30 USD
Availability: OutOfStock

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AutoTec II Forged Piston Set

SB Chevy 23-Degree

4.155 in. Bore

Forged 2618 Aluminum

3.750 in. Stroke

5.700 in. Rod Length

1.425 in. Compression Height

-23.9 cc Crown Volume

1.5 x 1.5 x 3.0 mm Ring Grooves

Set of 8

Racetec 1001649 AutoTec II Dish Piston Set Features:

Manufactured on 2618 material forgings that will accept mild blown or nitrous applications
CNC Precision used in every manufacturing operation
Valve pockets machined for oversized valves and high lift cams
Critically machined ring grooves for 1.5, 1.5, 3.0mm rings
Top ring land gas distribution grooves to enhance performance and improve ring seal
990-2800-51-15C 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

RaceTec 1001649 Autotec II Dish Piston Set Specs:

Engine Family: 23-Degree Small Block Chevy
Displacement reference: 407 cu. in. (6.7L)
Bore: 4.155 in.
Stroke: 3.750 in.
Rod Length: 5.700 in.
Compression Height: 1.425 in.
Crown Volume: -23.9 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 1001649 AutoTec II Dish Piston Set Notes:

Requires RaceTec RT4155 Ring Set or Equivalent (Sold Separately)
Compression Ratios:
- 9.5:1 @ w/64 cc Heads
- 9.1:1 @ w/68 cc Heads
- 8.9:1 @ w/70 cc 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 Height6.0

Package Width12.0

Package Length12.0

Weight12.0 PG

Part CategoryPerformance Parts

Pin Lock Rings IncludedYes

Compression Height (In)1.425

Bore (In)4.155

Wrist Pin StylePress or Full Floating