MFR Big Block Chevy 345cc Cylinder Heads

MFR Big Block Chevy 345cc Cylinder Heads


MFR Big Block Chevy 345cc Cylinder Heads are clean cast aluminum square port heads that are done in house with a 2.3/1.88 intake and exhaust valve job. Flat tappet, hydraulic or solid roller valve springs,  Stainless Steel Valves,  10° locks, retainers, Dart adjustable 3/8 guide plates with 7/16 rocker studs. Tool steel light weight or titanium retainers are available. I use these heads personally and found them to be of the utmost quality castings and machining. These are not ProComp or Speedmaster castings.



  • Fully Machined 345cc Clean Casting Aluminum Heads
  • AwesomeEngines® Rolled Radius 45° Valve Job
  • Ports with a 2.3/1.88 Valves Flow 395/290cfm @ .800″ Lift
  • Bronze Alloy Fully Machined Valve Guides
  • Utilizes Existing BBC Intake Manifolds
  • Uses Standard BBC Header Pattern
  • Uses Standard BBC Rocker Arms
  • All Stock Hardware Bolts Directly to the Cylinder Heads
  • Increased Deck Thickness to Support Power Adders
  • Accessory Bolt Holes In Stock Location
  • Uses 5 Extra Long Head Bolts Over the Exhaust
  • Machined to 119cc Clean Cast Combustion Chambers
  • Intake and Exhaust Ports have been Hand Ported after Valve Job
  • Stainless Steel 2.300″ /1.880″ Valves
  • All Valve Seats Hand Lapped to Insure Perfect Valve Seat Concentricity
  • Comp Cams 1.55 Dual Flat Tappet or Hydraulic Roller Springs for 630″ Lift
  • 10° Degree Chrome Moly Steel Retainers and Super Locks
  • U.S. PC Valve Stem Seals Installed
  • Hardened Spring Seats or Washers
  • Dart 7/16″ Rocker Studs and Dart Adjustable 3/8″ Guide Plates
  • Hot Washed Blown Dry, Lubed, Final Spring Pressure Set for Application
  • Professionally Assembled, Packaged and Sealed

Available Upgrades

116cc Combustion Chambers
+ $ 100.00
Manley Severe Duty Intake and Exhaust Valves
+ $ 295.00
Manley Extreme Duty Enconel Exhaust Valves
+ $ 395.00
Titanium Light Weight or Tool Steel Retainers Installed
+ $ 195.00
1.64″ Pac or Manley 261424 Double Roller Valve Springs and Titanium Retainers for 850″ Lift
+ $ 325.00
Pac 1247 or Manley 221447 Triple Roller Valve Springs and Titanium Retainers for 900″ Lift Package
+ $ 395.00
Comp Cams Ultra Pro Magnum  Chrome Moly Light Weight Roller Rockers
+ $ 375.00
Jomar Complete Stud Girdle Kit with all Hardware and Adjusting Nuts
+ $ 245.00
Jesel or T&D Sportsman Series Shaft Rocker System
+ $1295.00
Jesel or T&D Pro Series Shaft Rocker System
+ $1695.00
Fel Pro 1077 MLS Head Gasket 4.640 bore size and .041″ thickness, other sizes available (each)
+ $135.00
ARP Specific Fit Pro Series Head Stud Kit with 12 Point Fasteners and Washers
+ $ 275.00
ProFiler CNC Match Ported Intake Manifold
+ $ 495.00
Jomar Special CNC Ported 1¼” Spacer, Stud, Gaskets that actually makes up to 5hp and 10lbs of torque
+ $ 125.00

All Completed Heads Come with Specific Build Sheet, all Part numbers, Spring Rates and Installed Height Settings Supplied

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