My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

HKS 21004-AM003 4B11 2.2L Stroker Kit with Forged Pistons, Crankshaft & I-Beam Connecting Rods

(2008-2013 Mitsubishi Lancer; 2005-2008 Buick LaCrosse CXS; 1978-1980 Buick LeSabre Sport; 1973-1986 Buick Century T-Type; 1978-1980 Buick Skyhawk S)

Manufacturer

Picture for manufacturer HKS

Part Number

21004-AM003
8 reviews
Sale Price

$3,740.00

Estimated ship date Friday, December 11

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The HKS 21004-AM003 is a complete stroker kit engineered for the Mitsubishi 4B11 engine, increasing displacement from the stock 1,998cc to 2,139cc. The expanded displacement delivers a significant gain in torque output and enables proper pairing with large-frame turbochargers for maximum power potential. All components are precision-matched and designed to work together as a system for reliable, high-output performance.

Kit Includes:

  • HKS Forged Pistons — 86.5mm bore (OEM: 86mm), forged construction with 23.0mm pin bore and 12.1cc piston bowl; includes piston rings, wrist pins, and retaining clips
  • HKS Forged Full-Counter Crankshaft — 91mm stroke (OEM: 86mm), manufactured from special chrome molybdenum steel with Isonite (salt bath nitriding) surface treatment for exceptional durability
  • HKS I-Beam Forged Connecting Rods — cracked-cap I-beam design, carburized chrome molybdenum steel construction

Technical Specifications:

  • Bore: 86.5mm (OEM 86mm)
  • Stroke: 91mm (OEM 86mm)
  • Displacement: 2,139cc (OEM 1,998cc)
  • Pin Bore: 23.0mm
  • Piston Bowl: 12.1cc (OEM 4.5cc)
  • Compression Ratio: 8.7:1 (with 1.0mm head gasket), 8.6:1 (with 1.2mm gasket), 8.4:1 (with 1.6mm gasket)
  • Crankshaft Material: Special Chrome Molybdenum Steel + Isonite treatment
  • Connecting Rod Material: Carburized Chrome Molybdenum Steel

Installation Notes: Block boring and honing are required. Full-flow oil gallery modification is not required.

HKS stroker kits are developed from decades of motorsport engineering experience and are trusted by competitors in drag racing, road racing, rally, and top-speed events worldwide. The 21004-AM003 is the definitive internal engine upgrade for 4B11-powered builds targeting serious power levels.

Products specifications

Fits

2008-2013 Mitsubishi Lancer; 2005-2008 Buick LaCrosse CXS; 1978-1980 Buick LeSabre Sport; 1973-1986 Buick Century T-Type; 1978-1980 Buick Skyhawk S

Displacement

2.2L

Super pricing, fast shipments, good selection they have it all.

Some items are not auto specific but when you enter the auto info it does not let you purchase the item

Excellent customer service....<br>fast delivery<br>and good quality parts<br><br>

My second time ordering from Autoplicity. I price shop online and Autoplicity had the lowest price both times. Fast ship with email notifications. Autoplicity will now be my "First" site I go to for my auto accessories. Great job Autoplicity.

Great prices, quick shipping, customer service a bit difficult to reach. But, after reaching customer service, issue was resolved without a problem.

I hope the product is as good as the speed I received the item. I even made a mistake on my order, and it still arrived fast. Thanx, will do business with again.

Excellent low price, super fast shipping, and great communication. Top notch seller. Recommend highly!!

Great service. Quick shipping!

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy