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ProMAXX Cylinder Heads_GM LS1/LS2_Shocker CNC_227cc_2.080/1.600_64 cc
ProMAXX Cylinder Heads

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Optional Cylinder Heads

PMX-CLS-64S-2014B Bare
PMX-CLS-64S-2014HR Hydraulic Roller


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.

  • 227cc 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
  • Titanium Retainers
  • Multiple spring options
  • Designed, machined and assembled in the USA

Item# Item Name Price Qty Add
PMX-2014 Shocker CNC_GM LS1/LS2_227cc_Bare
$1,405.00
PMX-2015 Shocker CNC_GM LS1/LS2_227cc_H/R
$1,715.00
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Flow Chart:

Flow Data: cfm @ 28 inches of Water
Lift .100 .200 .300 .400 .500 .550 .600
Intake 74 149 212 259 284 293 300
Exhaust 65 121 159 192 219 225 229




Technical Specs:
Item Code PMX-CLS-64S-2014
Vendor ProMAXX Performance Products
Product Type Cylinder Heads
Product Model Shocker CNC Series
Engine Family General Motors LS1/LS2
Material 356-t6 cast aluminum
Weight 50 lbs
Combustion Chamber 64 cc
Plug Orientation Straight
Intake Runner 227 cc
Exhaust Runner 70 cc
Intake Valve Diameter 2.080
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
Valve Spacing OEM
Intake Gasket
Exhaust Gasket
Head Gasket
Spark Plug
Torque Specifications
Note: *Add 200.00 Core Charge*

Hydraulic Roller - .650 Max Lift
Closed 135 lbs @ 1.800
Open 375 lbs @ 1.200




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