Promaxx MAXX 317 BBC Cylinder head

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Product Description

The Maxx 317 is truly a rare breed in today’s market. An As Cast head that is just as efficient as competition’s CNC ported pieces. Independent flow bench testing shows over 385 cfm with 2.250 Intake valve and over 400 with 2.300 valves. This head will change the industry. Compare to any brand, this head makes power!

 

Please contact us for info and pricing to upgrade to 2.300 intake valve.

 

  • 317cc Intake runner
  • 24 degree Intake valve angle
  • 15 degree Exhaust valve angle
  • CNC inspired casting
  • Ultra-smooth casting
  • 356-T6 aluminum
  • Multiple valve sizes available
  • Over 400 cfm
  • .750 deck thickness
  • Diamond honed guides
  • Multiple spring options
  • 5 angle valve job
  • Professional Assembly
  • Machined and Assembled in USA
  • Assemblies include: 21-4N 1pc swirl polished back cut valves, 7/16 studs and guide plates

Technical specs

 

Combustion Chamber ……119cc
Weight …………………………78.00 lbs.
Intake Runner ……………. 317cc
Exhaust Runner …………..135cc
Intake Valve Size …………2.25”/2.300
Exhaust Valve Size …….. 1.88”
Spring Pressure

 

Hydraulic Roller .600 max lift
Closed …………………… 135 lbs. @ 1.800”
Open …………………….. 365 lbs. @ 1.350”
Solid Roller .700 max lift
Closed …………………… 220lbs. @2.000”
Open …………………….. 600 lbs. @ 1.300”
Solid Roller .900 max lift
Closed …………………… 325 lbs. @ 2.100”
Open …………………….. 840 lbs. @ 1.200”
******* other options available******
Valve Guide ……………Manganese Bronze
Valve Seal Material … Viton
Retainer Material ……Steel
Valve Job ……………… 5-angle
Head Bolts……………. ARP 135-3603 Mark IV/ 135-3607 Mark V
Head Studs ………….. ARP 235-4703 Mark IV/ 235-4713 Mark V
Valve Angle ………. 24/4 intake 15/4 exhaust
Stud Girdle………….Harland Sharp G1114 or equivalent
Valve Seats ……………Hardened Steel
Intake Gasket ………. Fel-Pro 1275
Exhaust Gasket ……. Fel-Pro 1412
Head Gasket ……….. Fel-Pro 1047 Mark V and Mark VI / 1017 Mark IV
Spark Plug …………. .750” Reach Gasket Seat
Torque specs …….. 80 Ft lbs. 3 increments using 30wt oil
Exhaust Ports ………. Raised .375

 

 

PART # BRIEF DESCRIPTION PLUG TYPE CHAMBER SIZE VALVE SIZE MAX LIFT

 

 

9317 317 BBC Bare   119 2.25/1.88  
9318 317 BBC Assy   119 2.25/1.88 .600 Hyd
9319 317 BBC Assy   119 2.25/1.88 .700 Solid Roller
9319T 317 BBC Assy   119 2.25/1.88 .700 Solid Roller Ti Retainers
9320 317 BBC Assy   119 2.25/1.88 .850 Solid Roller Ti Retainers

 

           

 

Flow Data

 

Flow Data @ 28″ water            
lift 200 300 400 500 600 700 800 900
Int 168 249 311 356 377 389 395 400
Ext 135 182 221 261 283 297 303

305

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$1,199.00
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