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ProMAXX Cylinder Heads_MOPAR Big Block_Shocker CNC_240cc_2.190/1.810_84 cc
ProMAXX Cylinder Heads

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Optional Cylinder Heads:

PMX-9240 Bare
PMX-9241 .650 Lift (Optional Springs)
PMX-9242 .750 Lift (Optional Springs)
PMX-9243 .750 Lift (Optional Springs) w/Ti Retainers


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.

  • 240cc Intake runner
  • Ultra smooth 356-t6 Aluminum
  • Precision CNC Machining
  • Unshrouded chamber
  • Diamond honed guides
  • Large spring pockets
  • 5 angle valve job
  • Precision CNC machining
  • Multiple spring options


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

Item# Item Name Price Qty Add
PMX-9241 Shocker CNC_MOPAR BB_240cc_.650 Max Lift
$2,260.00
PMX-9242 Shocker CNC_MOPAR BB_240cc_.750 Max Lift
$2,390.00
PMX-9243 Shocker CNC_MOPAR BB_240cc_.750 Max Lift_w/Ti Retainers
$2,540.00
PMX-9240 Shocker CNC_MOPAR BB_240cc_Bare
$2,080.00
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Flow Chart:

Flow Data: cfm @ 28 inches of Water
Lift .200 .300 .400 .500 .600 .700 .800 .900
Intake 157 224 275 305 318 323 327 330
Exhaust 108 152 184 208 227 239 247 253




Technical Specs:
Item Code PMX-9240-000
Vendor ProMAXX Performance Products
Product Type Cylinder Heads
Product Model Shocker CNC Series
Engine Family MOPAR Big Block
Material 356-t6 cast aluminum
Weight 72 lbs
Combustion Chamber 84 cc
Plug Orientation Angle
Intake Runner 240 cc
Exhaust Runner
Intake Valve Diameter 2.190
Exhaust Valve Diameter 1.810
Valve Seats Hardened Steel
Valve Guides Manganese Bronze
Valve Seals Viton
Standard Retainers Steel
Valve Job Type 5 Angle
Head Bolts
Valve Spacing OEM
Intake Gaskets
Exhaust Gaskets
Head Gaskets
Spark Plug
Torque Specifications




Valve Spring Pressures:

Hydraulic Roller - .650 Max Lift:
Closed
Open

Solid Roller - .750 Max Lift:
Closed
Open




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Cylinder Heads > ProMAXX Cylinder Heads > Chrysler _ Big Block