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 (Part# 315-6056) – PSK573-1-10 Up to .725 Lift CL 225# @ 1.90 OP 530# @ 1.28 C/BIND 1.18 O.D 1.55” Dual W/D I.D. 0.75

SOLID ROLLER (Part# 315-6058) – PSK623-1-10 Up to .750 Lift CL 290# @ 1.90 OP 625# @ 1.30 C/BIND 1.17 O.D 1.62” Dual W/D I.D. 0.74

SOLID ROLLER (Part# 315-5059) – PAC1224 Up to .850 Lift CL 275# @ 2.00 OP 810# @ 1.150 C/BIND 1.100 O.D 1.62” Dual I.D. 0.85


  • 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
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 Volume315cc
Exhaust Port Volume121cc
Intake Valve Diameter (in)2.30 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 Hydraulic2.30 +.250
Exhaust Valve Hydraulic1.880 Stock Length
Intake Valve Solid2.30 +.250
Exhaust Valve Solid1.880 +.100
RetainersHardened Chrome Moly
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
Valve Locks7 Degree and 10 Degree

Part Specification

Flo-Tek Cylinder HeadID#Part Number
BBC 315 Bare850134007389315-500
BBC 315 Hyd Roller Assembled850134007662315-6056
BBC 315 Solid Roller Assembled850134007679315-6058
BBC 315 Solid Roller PAC Assembled850134007563315-5059

Flow Chart


Dimensions & Weight

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

Additional information

Weight 43 lbs
Dimensions 22.25 × 8.5 × 5 in

BBC 315 Bare (315-500), BBC 315 Hyd Roller Assembled (315-6056), BBC 315 Solid Roller Assembled (315-6058), BBC 315 Solid Roller PAC Assembled (315-5059)