FLOTEK's medium sized 290cc oval port cylinder head with 112 combustion chamber is recommended for moderate street or street/strip big block Chevys with displacements up to 509 cubic inches, operating at or below 6500 RPM. Capable of flowing 367 CFM at 0.600″ of lift; tested on Super Flow Bench 1020. It may be necessary to slightly clearance or modify the the piston due to our more efficient heart shaped combustion chamber design with some domed aftermarket pistons, most of the newer designed dome profiles will clear. FLOTEK recommends material be removed from the piston and not the cylinder head. Our combustion chamber shapes are very critical to flow and altering the cylinder head can unfavorably affect flow and power performance. It is the customer's responsibility to verify proper piston to head clearance. Heads are designed for 3/8″ pushrods. Larger pushrods will not fit without clearance and is not recommended since some areas are very thin. FLOTEK recommends the use of .120″ thick-wall pushrods.
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