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Ray Barton / A2Speed 6.4L (392 CID) Based HEMI Forged Long Block

SKU:A2S-392FSB
Dimensions:42 x 42 x 42
Weight:360.0 lbs
Manufacturer:A2Speed
Original Price: $11,024.99
On Sale For:  $9,090.00
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A2Speed Forged 6.4, 392 Short Block Specs

  • Displacement: 392 CID (6.4L)
  • Bore: 4.090
  • Stroke: 3.724
  • Boosted Compression Ratio: 9.8 : 1
  • Naturally Aspirated Compression Ratio: 11 : 1
  • Warranty: 3 Year / 36,000 mile

HEMI Rotating Assembly Components, Features, & Benefits:

  • Mopar Forged Steel Crankshaft
  • Molnar Forged H Beam Bushed Connecting Rods w/ARP 2000 Rod Bolts
  • Standard and Boost Ready Options Available
  • Diamond High Performance Forged 2618 Aluminum Pistons
    • Piston Balance: 1 gram
    • 2618 Alloy for Strength and Durability
    • Duel Pin Oilers
    • Contact Reduction Grooves
    • Accumulator Grooves
    • Forged Side Reliefs
    • FEA Designed Forging
    • ISO 9000 Certified
    • X Style Forging
    • Optional Piston Coatings
  • Diamond High Performance Full Seal Piston Rings
  • Chromoly Wrist Pins w/Wire Locks
  • King Bearings ENSIM Designed Main and Rod Bearings
    • Optional Coatings for Rod and Main Bearings

Creating Your HEMI Short Block:

Core Disassembly, Assessment & Validation

  • Core Inspection
  • Core Disassembly (If Required)
  • As Received Measurements
  • Hot Tank Block
  • Clean Oil Galleys
  • Deburr Edges as Required
  • Chafer all 90 degree corners
  • Radius bottom of Cylinder Bores
  • Chase Threads (If Required)

Machine Shop

  • Verify Deck Surface
  • Verify Bore Centerlines
  • Hone Cylinders w/Honing Plate
  • Install Billet Main Caps (Optional)
  • Line Hone
  • Supply and Install Plugs at Oil Squirters
  • Clearance Block / Pistons (If Required)

Short Block Final Assembly

  • Paint Block 6.1, 6.4: HEMI Orange, 5.7: Black
  • Install Crankshaft and Main Bearings, Maintain 0.0003 – 1” Tolerance @ bearings and 0.0005" Runout
  • Cut and Fit Piston Rings
  • Install Pistons and Connecting Rods; Maintain 0.0003 – 1” tolerance @ bearings and 0.0005” tolerance @ piston to cylinder wall.
  • Install Rear Main Seal

Our HEMI Long Block Includes a Ray Barton / A2Speed Short Block Plus

  • CNC Ported Heads
  • Replacement Oil Pump
  • Comp Cam & Manley Chromoly Pushrods (Ray Barton Spec)
  • Cometic Head Gaskets
  • OEM Mopar Lifters & Yokes

A2Speed Thitek CNC Ported 6.4 HEMI Heads (Thitek Bear Heads Optional)

  • CNC Port Heads
  • Performance Valve Job (seats and valves shaped)
  • PSI 1511 Springs
  • Performance Valve Guide Preparation
  • Hardened Steel Retainers
  • Hardened Steel Locators
  • Viton Valve Seals
  • Capable of up to .650” Lift
 
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The Home for Ray Barton Racing Engines built GEN III HEMI’s

A2Speed is now providing the HEMI community with the best of the best in regards to engine building companies. Our motors are found in some of the highest horse power GEN III HEMI’s around the country, and are proven to work, and work reliably.

About A2Speed
Quality Products and Services
  • About Us
  • What We Do
  • How We Do It
  • Our Quality
A2Speed is an employee owned automotive performance parts company, specializing in the Gen III HEMI engine and the cars & trucks it powers. Just like you we are Hemi enthusiasts, and like you we are only interested in proven performance solutions. Good enough isn’t. People who invest in performance modifications want parts that last decades, not years. The effort is only valuable if the result is better than good enough, and frankly these days that’s hard to do.

A2Speed’s GEN III HEMI Background

Many of us at A2Speed have been working on the Gen III since its inception. As a team we are immersed in the Hemi world. We own, drive, modify, race and occasionally…break them. We use this experience to create SOLUTIONS, not just parts. Automotive engineering has advanced such that it is often difficult to improve on the work done by the OEMs. Difficult, not impossible. Utilizing advanced 3D modeling, CFD and stress simulations coupled with rapid prototyping, allow for the development of specialized parts that would be impractical at OEM volumes. Solutions validated with real world testing. Craftsmen level quality; and because we don’t have the layered overhead, our prices are often at or below the OEM price.

Advanced Aerospace Grade Machining

Production manufacturing is performed by partner companies that have proven track records for quality and timely deliveries. We look for certifications such as ISO-9001 and AS-9100 along with ITAR and GIDEP registrations. Several of the companies we work with regularly supply major aerospace firms and the DOD. Why use outside machining services? So that you get a better part at a better price. By utilizing only the machine cycles we need, and leveraging the superior skills and years of experience, A2Speed can give you exceptional quality at truly affordable prices.

Our company is guided by a set of core values and beliefs


  • We know that we are a community, not a “market”.
  • We recognize that we serve this community at the pleasure of its members.
  • We understand the passions, challenges and rewards that drive the enthusiast.
  • We believe that function drives form, improved performance improves appearance.
  • We know that one company can’t do it all, therefore we value partnerships.

How This Applies to Our Customers


  • We never settle for anything less than perfection.
  • All of our parts are put under intense testing before being released to you
  • You can feel secure because we use both our closest partners and our own cars to test A2Speed’s products
  • Finally we know that just having a great product isn’t enough, thus we strive to offer superior customer service, and the lowest prices. Giving you the best experience possible from start to finish.
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