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Engines and Components› Pistons and Piston Rings

Modern Muscle Xtreme

426 HEMI High Compression Stroker Kit

Name: 426 HEMI High Compression Stroker Kit
Brand: Modern Muscle Xtreme
SKU: MMP-64L-426-HCOMP
Price: 2849.95 USD
Availability: InStock

$4,799.95 $2,849.95 Save $1,950.00

SKU: MMP-64L-426-HCOMP

In Stock

Ships by Sep 12

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Overview

The Modern Muscle Xtreme 426 HEMI High Compression Stroker Kit is a rotating assembly designed to increase displacement from a 6.4L HEMI. This kit features custom-spec forged M142 pistons manufactured by MAHLE Motorsports, known for their advanced specifications.

The kit includes Manley or Molnar 4.050 stroke crankshafts, M142 material or 4032 alloy pistons with coated ring lands and skirts, and deep valve reliefs. It also comes with file-fit premium rings, Manley H-beam or Molnar Technologies forged rods, and offers an 11:1 compression ratio.

Show original supplier description

The Modern Muscle Performance (MMX) 426 High Compression HEMI 6.4L Based Stroker Kit is engineered to significantly increase the cubic inches of your 6.4L HEMI engine. This premium rotating assembly is built using custom-specification forged M142 pistons, manufactured by MAHLE Motorsports, incorporating features that differentiate MMX piston and rod solutions. Key features include a Manley or Molnar Forged 4.050 Stroke Crankshaft and M142 Material or 4032 Alloy Pistons with enhanced durability. The kit also includes file-fit premium rings, and choice of Power Adder 6.125" Center to Center Molnar Technologies Forged Rods or Manley H Beam Rods. This configuration achieves an 11:1 compression ratio, with variations depending on the head gasket used (11.3:1 with stock heads, 11.0:1 with .040 Cometic gasket, and 10.8:1 with .054 Cometic gasket). The valve reliefs are deep enough for up to 2.200" intake and 1.650" exhaust valves. The complete MMX 426 High Compression Stroker Rotating Assembly includes a Manley, Molnar, or Callies 8CWT 4.050 Stroke Crankshaft, a Manley, Molnar, or Callies 6.125 connecting rod with a .927 pin, and an MMX Spec Mahle 4.090 STD 6.4 Bore Custom Stroker Piston (available in 4.090 and 4.100 bore sizes). Please note that professional installation and clearance confirmation are required. Additionally, buyers are advised to check local and state laws for emissions compliance before purchasing.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

Brand	Modern Muscle Xtreme
Part Number	MMP-64L-426-HCOMP
Category	Engines and Components

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Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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