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  Home > Cylinder Heads > ProMAXX Cylinder Heads > Chrysler _ Small Block >

ProMAXX Cylinder Heads_MOPAR Small Block_Shocker CNC_185cc_2.020/1.600_63cc
ProMAXX Cylinder Heads

Photo may not be actual product


Optional Cylinder Heads:

PMX-9561 Bare
PMX-9560 Hydraulic Flat Tappet

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.

  • 185cc 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-9561 Shocker CNC_MOPAR SB_185cc_Bare
PMX-9560 Shocker CNC_MOPAR SB_185cc_HFT_.575 Max Lift
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Flow Chart:

Flow Data: cfm @ 28 inches of Water
Lift .200 .300 .400 .500 .600 .700
Intake 142 202 251 278 284 286
Exhaust 124 159 190 203 219 231

Technical Specs:
Item Code PMX-9561-000
Vendor ProMAXX Performance Products
Product Type Cylinder Heads
Product Model Shocker CNC Series
Engine Family MOPAR Small Block
Material 356-t6 cast aluminum
Weight 50 lbs
Combustion Chamber 63 cc
Plug Orientation Straight
Intake Runner 185 cc
Exhaust Runner 80 cc
Intake Valve Diameter 2.020
Exhaust Valve Diameter 1.600
Valve Seats Hardened Steel
Valve Guides Manganese Bronze
Valve Seals Viton
Standard Retainers Steel
Valve Job Type 5 Angle
Head Bolts ARP 144-3602
Valve Spacing OEM
Intake Gaskets Fel-Pro 1213
Exhaust Gaskets Fel-Pro 1432
Head Gaskets Fel-Pro 8553PT
Spark Plug .750 Reach Gasket Seat
Torque Specifications 80 ft lbs in 3 increments using 30wt oil

Valve Spring Pressures:

Hydraulic Flat Tappet - .600 Max Lift:
Closed 115 lbs @ 1.800
Open 310 lbs @ 1.225

Hydraulic Roller - .700 Max Lift:
Closed 145 lbs @ 1.800
Open 325 lbs @ 1.200

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Cylinder Heads > ProMAXX Cylinder Heads > Chrysler _ Small Block