Chev 350 Vortec 5.7L GM Cast Iron Cylinder Head Casting 10239906 # 12691726

Cylinder Head, Vortec, Assembled, Cast Iron, 64cc Chamber, 170cc Intake Runner, Chevy, Small Block, Each

Combustion Chamber Volume (cc):

64

Intake Runner Volume (cc):

170cc

Cylinder Head Style:

Assembled

Cylinder Head Material:

Cast iron

Intake Port Shape:

Rectangular

Intake Valve Diameter (in.):

1.940 in.

CNC-Machined Combustion Chamber:

No

CNC-Machined Intake Runner:

No

CNC-Machined Exhaust Runner:

No

Intake Port Location:

Standard

Exhaust Port Shape:

Rectangular

Exhaust Port Location:

Standard

Spark Plug Style:

Straight

Intake Valves Included:

Yes

Exhaust Valves Included:

Yes

Exhaust Valve Diameter (in.):

1.500 in.

Valve Springs Included:

Yes

Maximum Valve Lift (in.):

0.475 in.

Camshaft Style:

Hydraulic roller

Damper Spring Included:

Yes

Number of Springs Per Valve:

Single

Retainers Included:

Yes

Retainer Material:

Steel

Locks Included:

Yes

Lock Style:

7 degree

Valve Stem Seals Included:

Yes

Valve Stem Seal Style:

Positive stop

Rocker Arm Studs Included:

Yes

Rocker Arms Included:

No

Rocker Arm Nuts Included:

No

Guideplates Included:

No

Valve Cover Mounting Style:

Centerbolt

Accessory Bolt Holes Drilled:

Yes

Valve Guides Included:

Yes

Valve Guide Material:

Manganese bronze

Valve Seats Machined:

Yes

Cylinder Head Color:

Natural

Steam Holes Drilled:

No

Oiling Style:

Through pushrod

Machined for O-Ring:

No

Heat Crossover:

No

Quantity:

Sold individually.

Notes:

Max Valve Lift as delivered is 0.475 in. and anything above requires machining of the valve guide bosses and checking valve seal-to-valve spring retainer clearance.

Chevrolet Performance Vortec Cylinder Heads

Chevrolet Performance cast iron Vortec cylinder heads will fit 1958 and later small block Chevy engines, and offer a 20 to 40 hp increase over earlier cast iron small block heads. Features include fast burn combustion chambers, and a high-velocity port design. They require the use of a Vortec-style intake and self-aligning rocker arms, and come complete with valves, springs, and retainers.