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ProMAXX Cylinder Heads_Ford Mod Motor 2V SOHC_Shocker CNC_185cc_Romeo PI Head_1.780/1.450_46 cc
ProMAXX Cylinder Heads

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Optional Cylinder Heads

PMX-1003R Stage II Bare
PMX-1004R Stage II Assembled
PMX-1005R Stage III Bare
PMX-1006R Stage III Assembled


ProMAXX Shocker CNC Series is the top of the line performance cylinder head. It features professionally designed runners and chambers that are meticulously CNC ported. The all new ProMAXX ultra smooth Grade A 356-T6 aluminum casting is CNC machined to create the perfect platform for newly developed runner and chamber designs. This is combined with a 5 angle competition valve job, diamond honed bronze guides, large spring pockets and professional assembly, performed right here in the United States. Pro MAXX Shocker CNC Heads are proof that going fast doesn’t have to break the bank.

  • New Castings
  • Fits Romeo Block
  • Ultra Smooth 356-t6 Aluminum
  • 180cc Intake Runner
  • 5 Angle Valve Job
  • Precision CNC Machining
  • Custom Beehive Springs
  • Titanium Retainers
  • Diamond Honed Bronze Guides


Assembled heads feature:
  • One piece stainless steel valves
  • 21-4N back cut, swirl polished
  • Multiple Valve Sizes
  • Designed, machined and assembled in the USA

Item# Item Name Price Qty Add
PMX-1004R Shocker CNC_Ford 4.6L Romeo_Stage II_Assembled (w/o cam)
$1,925.00
PMX-1003R Shocker CNC_Ford 4.6L Romeo_Stage II_Bare
$1,600.00
PMX-1006R Shocker CNC_Ford 4.6L Romeo_Stage III_Assembled (w/o Cam)
$2,180.00
PMX-1005R Shocker CNC_Ford 4.6L Romeo_Stage III_Bare
$1,600.00
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Flow Chart:

Flow Data: cfm @ 28 inches of Water
Lift .100 .200 .300 .400 .500 .550 .600
Intake 64 116 162 192 213 217
 218
Exhaust 52 98 135 162 183 189 193




Technical Specs:
Item Code PMX-1003R-000
Vendor ProMAXX Performance Products
Product Type Cylinder Heads
Product Model Shocker CNC Series
Engine Family Ford 4.6L PI Romeo
Material 356-t6 cast aluminum
Weight 72 lbs
Combustion Chamber 46 cc
Plug Orientation Angle
Intake Runner 180 cc
Exhaust Runner 68 cc
Intake Valve Diameter 1.780
Exhaust Valve Diameter 1.450
Valve Seats Hardened Steel
Valve Guides Manganese Bronze
Valve Seals Viton
Standard Retainers Titanium
Valve Job Type 5 Angle
Head Bolts
Valve Spacing OEM
Intake Gasket
Exhaust Gasket
Head Gasket
Spark Plug OEM
Torque Specifications




Valve Spring Pressures:

Hydraulic Roller- .600 Max Lift
Closed 115 lbs @ 1.740
Open 285 lbs @ 1.140




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Cylinder Heads > ProMAXX Cylinder Heads > Ford _ Modular