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Chevrolet Performance Vortec Cylinder Heads
Cylinder Head, Vortec, Assembled, Cast Iron, 64cc Chamber, 170cc Intake Runner, Chevy, Small Block, Each
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Overview
Brand:
Manufacturer's Part Number:
12691728
Part Type:
Product Line:
Summit Racing Part Number:
NAL-12691728
Combustion Chamber Volume (cc):
64
Intake Runner Volume (cc):
170cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast iron
Camshaft Style:
Hydraulic flat tappet
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.
Outside Diameter of Outer Spring (in.):
1.250 in.
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 Arm Nut Thread Size:
3/8 in.-24
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
Remanufactured:
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. The installed valve springs have approximately 80 lbs. seat pressure and 195 lbs. open at 0.450 in. lift and are compatible with the stock hydraulic roller camshaft and most hydraulic flat tappet camshafts.
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.
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