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Cylinder Heads

Cylinder head offerings from Raby Engine Development in conjunction with Hoffman Automotive Machine. The philosophy at Hoffman Automotive Machine is the same today as it was when we opened the doors in 1996; to provide the best possible cylinder heads for any given application. Over the years we have continuously met that promise.

In 2003, H.A.M. partnered with Raby’s Aircooled Technology to develop specific cylinder head combinations to meet the needs of R.A.T.’s engine programs. In 2004 R.A.T. began distributing some of these offerings to the public. In that time we have sold hundreds of pairs of heads for a variety of applications. The reputation of our cylinder heads is well established and is widely considered the Gold Standard for performance and reliability.

Today’s heads encompass years of refinements and R&D. The amount of Type 4 cylinder head R&D we’ve done is staggering and has allowed us to hone our offerings to 3 specific products that Jake Raby has found to meet the needs of over 95% of all Type 4 engine builds. Each offering, from the Camper Specials to the LE-200’s, share a thoroughbred pedigree of fine parts, exquisite machine work and obsessive attention to detail. Purchase our heads with the confidence that you’re buying the best Type 4 cylinders heads in the world.

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  1. Dual Valve Springs 8/9 Stems
  2. Chromoly Valve Retainers - set of 8
  3. Cylinder Head Nut
  4. Cylinder Head Washer
  5. CS Oval Port Cylinder Heads

    CS Oval Port Cylinder Heads Item#:07600

    $2,840.00
    • Castings: AMC
    • Chambers: 48.5-49.5cc’s, Stock 2.0 Bus
    • Chamber Step: .75mm to simulate O.E. head gasket thickness.*
    • Plug angle: Stock 2.0 Bus
    • Valve sizes: 42 x 36
    • Intake Ports: Stock AMC with hand blending to seats.
    • Exhaust Ports: Long side radius machined with in-house designed cutter, short side radius chamfered.
    ALL CYLINDER HEADS ARE SPECIAL ORDER AND MUST BE ORDERED SEPARATELY AND PAID FOR WHEN ORDERED. All cylinder heads are sold only in pairs. PLEASE ALLOW 4 WEEKS TO CREATE YOUR CYLINDER HEADS. Learn More
  6. CS Square Port Cylinder Heads

    CS Square Port Cylinder Heads Item#:07601

    $2,940.00
    • Castings: AMC
    • Chambers: 48.5-49.5cc’s, Stock 2.0 Bus
    • Chamber Step: .75mm to simulate O.E. head gasket thickness.*
    • Plug angle: Stock 2.0 Bus
    • Valve sizes: 42 x 36
    • Intake Ports: Stock AMC with hand blending to seats.
    • Exhaust Ports: Long side radius machined with in-house designed cutter, short side radius chamfered.
    ALL CYLINDER HEADS ARE SPECIAL ORDER AND MUST BE ORDERED SEPARATELY AND PAID FOR WHEN ORDERED. All cylinder heads are sold only in pairs. PLEASE ALLOW 4 WEEKS TO CREATE YOUR CYLINDER HEADS. Learn More
  7. RS+ Cylinder Heads

    RS+ Cylinder Heads Item#:07607

    $3,535.00
    • Castings: AMC
    • Chambers: CNC machined 2.0 914
    • Chamber Step: 95.0 x 1.0mm*
    • Plug angle: 2.0 914
    • Valve sizes: 42mm x 36mm by Manley
    • Standard Springs & Retainers: Crower HD Single springs for 122lbs of seat pressure and 222lbs at .460" lift & Chromoly retainers
    • Upgraded Springs & Retainers: Premium dual Crower set for 150lbs seat pressure & 320lbs at .530” valve lift & Crower Chromoly retainers ($200 upcharge)
    • Keepers: Hardened and ground for clearance
    • Intake Ports: Fully CNC machined with hand finished details.
    • Exhaust Ports: Fully CNC machined with hand finishing.

    ALL CYLINDER HEADS ARE SPECIAL ORDER AND MUST BE ORDERED SEPARATELY AND PAID FOR WHEN ORDERED. All cylinder heads are sold only in pairs. PLEASE ALLOW 4 WEEKS TO CREATE YOUR CYLINDER HEADS.

    Learn More
  8. LE200 Cylinder Heads

    LE200 Cylinder Heads Item#:7608

    $3,895.00
    • Castings: AMC
    • Chambers: CNC machined 2.0 914
    • Chamber Step: 95.0 x 1.0mm *
    • Plug angle: 2.0 914
    • Plug size: M12
    • Valve sizes: 44mm x 38mm by Manley
    • Springs: Premium dual Crower set for 160lbs seat pressure & 330lbs at .520” valve lift.
    • Retainers: Crower Chromoly
    • Keepers: Hardened and ground for clearance
    • Intake Ports: Fully CNC machined with hand finished details.
    • Exhaust Ports: Fully CNC machined with hand finishing.

    Introduced in 2004, the LE-200’s have become the benchmark for superior high-end performance Type 4 engines. So named because they represent the Leading Edge of technology and the intake ports flowed 200CFM @ .500” valve lift, a value they exceeded by the 2nd version. The exhaust ports average flow is 75-77% of the average intake port flow, making the LE-200’s an excellent choice for track cars.

    ALL CYLINDER HEADS ARE SPECIAL ORDER AND MUST BE ORDERED SEPARATELY AND PAID FOR WHEN ORDERED. All cylinder heads are sold only in pairs. PLEASE ALLOW 4 WEEKS TO CREATE YOUR CYLINDER HEADS.

    Learn More

8 Item(s)

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Set Descending Direction