Product Summary

343, 360, 390, 401, Assembled Cylinder Head Style

  • Includes a 54cc dual-quench combustion chamber
  • They have hand-blended intake and exhaust bowls
  • Features CNC-matched intake/exhaust ports in standard location
  • Includes a much thicker deck surface when compared to other brands
  • Specifically designed to fit the AMC 343, 360, 390, 401 V8 engines

Key Specs

Cylinder Head StyleAssembled
Material TypeAluminum
Combustion Chamber Volume54cc
Intake Runner Volume185cc

Need To Know

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Direct bolt-on head for AMC 343, 360, 390, and 401 Stock and Super Stock racers. No port profiling or bowl blending of ports.

  • Out-of-the-Box Bolt-On Performance
  • Hand-Blended Intake and Exhaust Bowls
  • CNC-Matched Intake/Exhaust Ports in Std Location
  • Thicker Deck Surfaces than Other Brands
  • 54cc Dual-Quench Combustion Chamber
  • Offers Improved Mid To High Lift Flow


CARB Warning

Follow EPA, CARB, and state regulations for engine changes

Emissions warning: this part is for vehicle engine changes, not direct oem engine replacements. In California, engine changes are legal when done in compliance with California bureau of automotive repairs (bar) engine change policy. For assistance, call bar referee at: (800) 622-7733. And see https://bar.Ca.Gov/consumer/smog_check_program/engine_changes. All customers must comply with federal epa mobile source enforcement memorandum no. 1a (and addendum) and all applicable state regulations when conducting engine changes. Improper installation and/or use of this part in California may subject the installer and/or owner to a $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and laws of all states for use of this engine change part on makes or models of vehicles that render them noncompliant with applicable state and/or federal emission laws with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine


Cylinder Head StyleAssembled
Material TypeAluminum
Combustion Chamber Volume54cc
Intake Runner Volume185cc
Exhaust Runner Volume70cc
Combustion Chamber Volume Range50cc - 59cc
Intake Runner Volume Range180cc - 189cc
Exhaust Runner Volume Range70cc - 79cc
CNC-Machined RunnersNo
CNC-Machined Combustion ChamberNo
Intake Port LocationStandard
Exhaust Port LocationStandard
Intake Valve Diameter2.020"
Intake Valves IncludedYes
Intake Valve Angle18
Exhaust Valve Diameter1.600"
Exhaust Valves IncludedYes
Valve Spring IncludedYes
Spring Diameter1.550"
Damper Spring IncludedYes
Number of Springs Per ValveSingle
Maximum Lift0.580"
Machined for O-RingNo
Valve Seat Machine Style3-angle
Valve Seats MachinedYes
Valve Seat MaterialDuctile Iron
Valve Stem Seals IncludedYes
Valve Stem Seal TypePositive Stop
Valve Guides IncludedYes
Valve Guide MaterialManganese Bronze
Locks IncludedYes
Lock Style7 Degree
Retainers IncludedYes
Retainer MaterialSteel
Guideplates IncludedYes
Guideplate Pushrod Size0.3125"
Rocker Arms IncludedNo
Rocker Arm Studs IncludedYes
Rocker Arm Nuts IncludedNo
Oiling StyleThrough Head
Heat CrossoverNo
Steam Holes DrilledNo
Accessory Bolt Holes DrilledYes
Valve Cover Mounting StylePerimeter Bolt
NotesUses 14mm spark plugs with 3/4" reach, and flat gasket seals
Sold in QuantityEach
GTIN Code085347601196