Introducing the ALL-NEW, Exceptional Steel Cast Big Block Chevy 315 cc head from FLOTEK! With a beautiful Polycrystalline Diamond Cut Finish, and cast from a permanent steel mold, this makes the FLOTEK Cylinder Head an easy choice! Unbeatable design, superb performance and exceptional pricing accomplish everything for the street or strip enthusiast!

A powerful, out-of-the-box cylinder head design matched with an outstanding, unbeatable casting technology. We are here to tell you… this BBC head does just that! FLOTEK Aluminum Cylinder Heads are a great choice for out of the box horse power. These FLOTEK Cylinder heads have thick Deck Design and High Capacity water jackets that makes them a reliable choice for street or strip applications.

The FLOTEK BBC 315 takes stock pistons and has raised valve cover rails. The BBC 315 Exhaust Port location is raised .360″.


HYDRAULIC ROLLER (.600 Lift) – Spring Kit: PSK-637-1-7 Hydraulic Roller Dual Valve Spring 1.50″ O.D., Max RPM 6500-6700
Valve Spring: CL 178# @ 1.900, OP 446# @ 1.300 C.BIND 1.170

SOLID ROLLER (.700 Lift) – Spring Kit: PAC 1228 Roller Valve Race Spring 1.625″ O.D Solid Roller Valve Spring, Max RPM 7200-7400
Valve Spring: CL 280# @ 2.100, OP 847# @ 1.150, C.BIND 1.100

SOLID ROLLER (.800 Lift) – Spring Kit: PAC 1248 Roller Valve Race Spring 1.645″ O.D Solid Roller Valve Spring, Max RPM 7200-7400
Valve Spring: CL 332# @ 2.100, OP 950# @ 1.200 C.BIND 1.130 Triple Spring

  • Headers will bolt on in most applications. Some may have interference.
  • Recommendations: Hooker Super Comp Headers
  • Stock Bolt Spread
  • May be necessary to use lowered motor mounts


Specifications, Features & Optional Supporting Components

Head Bolt Torque75 Ft Lbs w/ oil
Rocker Stud Torque50 Ft Lbs w/ oil
Intake Port GasketFel Pro 1252-3 (320) Fel Pro 1211 (360)
Exhaust Port GasketFel Pro 1404
Head GasketFel Pro 1017-1 (4.500) 1057 (4.630)
Head Bolts & StudsARP 135-3703 (12pt) 135-3606 (6pt) 235-4303 (Stud)
Stud GirdleHarland Sharpe G1114 (7/16)
Suggested ManifoldVictor Jr, Super Victor
Spark Plug Starting Range14mm (.750) Accel #416
Intake Port Volume320cc
Exhaust Port Volume121cc
Intake Valve Diameter (in)2.25 in
Exhaust Valve Diameter (in)1.88 in
Intake Valve Angle(in)24/4
Exhaust Valve Angle(in)15/4
Valve Guide MaterialBronze
Valve Seat Machine Style3-Angle
Combustion Chambers121cc
Max Spring Pocket Diameter1.625” O.D.
Rocker Arm Nut Thread Size7/16-20 in
Valve Cover Mounting StylePerimeter Bolt
Accessory Bolt Holes DrilledYes

Basic Package Components:
Intake Valve .6002.250 +.100
Exhaust Valve .6001.880 +.100
Intake Valve .7002.250 +.250
Exhaust Valve .7001.880 +.100
Intake Valve .8002.250 +.250
Exhaust Valve .8001.880 +.100
RetainersHardened Chrome Moly
Valve Locks .6007 Degree Valve Locks
Valve Locks .70010 Degree Valve Locks
Valve Locks .80010 Degree Valve Locks
Guide PlatesDART 2700123-4/PC-4247
Rocker StudMust have Clearance for Valve Spring Retainers
Valve SealsViton Positive Seals
Spring CupHardened Steel Cups
Valve Seat MaterialPowdered Metal
Valve GuidesManganese Bronze

Part Specification

Flo-Tek Cylinder HeadID#Part Number
BBC 315 Assembled .600 lift850134007365315-5056
BBC 315 Assembled .700 lift850134007396315-5057
BBC 315 Assembled .800 lift850134007372315-5058
BBC 315 Bare850134007389315-500

Flow Chart



Dimensions & Weight

Big Block Chevy Bare31 Pounds
Big Block Chevy Assembled39.6 Pounds

Additional information

Weight 43 lbs
Dimensions 22.25 x 8.5 x 5 in

BBC 315 Assembled .600 lift (315-5056), BBC 315 Assembled .700 lift (315-5057), BBC 315 Assembled .800 lift (315-5058), BBC 315 Bare (315-500)