What is the primary benefit of using 4032 aluminum for these pistons?

4032 aluminum alloy offers a strong balance between high tensile strength and controlled thermal expansion. This makes it well-suited for performance engines that experience significant heat and stress, helping to prevent issues like piston seizure or excessive wear.

What does the 'Step2' designation mean for these HKS pistons?

The Step2 designation indicates specific design enhancements by HKS over their standard forged pistons. This typically includes optimized piston crown shapes for improved combustion efficiency and detonation resistance, as well as refined skirt designs for quieter operation and reduced friction.

Are these pistons compatible with all RB26 engine builds?

These pistons are designed for the RB26 engine with an 86.5mm bore. However, compatibility with specific modifications, cylinder heads, and other engine components should always be confirmed with your engine builder or a qualified mechanic to ensure proper fitment and performance.

HKS Step2 Forged Piston Kit RB26 86.5mm Bore 21003-AN013

Name: HKS Step2 Forged Piston Kit For RB26 - 86.5mm Bore
Brand: HKS
SKU: hks-hks-step2-forged-piston-kit-for-rb26-86-5mm-bore-t14-459857
Price: 2409.72 USD
Availability: BackOrder

HKS Step2 Forged Piston Kit For RB26 - 86.5mm Bore

$2409.72

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

HKS Step2 Forged Piston Kit for RB26 engines. 86.5mm bore, 21003-AN013. Built for high-performance builds.

Key Features

Fits RB26 engines with an 86.5mm bore.
Constructed from high-strength 4032 aluminum alloy for durability.
Step2 design incorporates optimized combustion chambers and skirt profiles.
Designed to support increased boost pressures and higher RPMs.
HKS part number 21003-AN013.

This piston kit is designed for RB26 engines. Please verify compatibility with your specific engine build and consult with a professional mechanic.

Secure CheckoutFast Shipping631-982-0042

Product Details

Forged from high-strength 4032 aluminum alloy, these HKS Step2 pistons are built to handle the demands of a performance-tuned RB26 engine. The 86.5mm bore size is a common upgrade for those looking to increase displacement and power output from their legendary inline-six. HKS has a long history of developing parts for these engines, and this kit represents their commitment to robust internal components that can withstand significant stress.

The Step2 designation means these pistons incorporate specific design elements aimed at improved performance and durability over standard forged pistons. This includes features like optimized piston crown shapes for better combustion and reduced detonation, along with skirt designs that promote quieter operation and reduced friction. The material choice, 4032 aluminum, offers a good balance of strength and thermal expansion properties, making it suitable for engines that see frequent hard use and higher operating temperatures. This kit is designed for builders who are pushing their RB26 beyond stock specifications and require components that can reliably support increased boost pressures and RPMs.

When rebuilding or significantly upgrading your RB26 engine, using a well-made piston kit like this HKS Step2 set is crucial for long-term reliability. It's important to note that this kit is not CARB approved and cannot be shipped to California. Always consult your engine builder or a qualified mechanic for specific installation requirements and recommendations for your build.