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Chevrolet Performance Vortec Small Port Bowtie Cylinder Heads 25534421

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Cylinder Head, Vortec Bowtie, Small Port, Iron, Assembled, 66cc Chamber, 185cc Intake Runner, Chevy, 350, Each

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Estimated Ship Date: 10/15/2014 (if ordered today) Would you rather pick it up? Select Location

Manufacturer's Part Number: 25534421
Part Type: Cylinder Heads
Summit Racing Part Number: NAL-25534421

Cylinder Head Style: Assembled
Cylinder Head Material: Cast iron
Cylinder Head Finish: Natural
Combustion Chamber Volume (cc): 66
CNC-Machined Combustion Chamber: No
Intake Runner Volume (cc): 185cc
Exhaust Runner Volume (cc): 65cc
CNC-Machined Intake Runner: No
CNC-Machined Exhaust Runner: No
Intake Port Shape: Rectangular
Intake Port Location: Standard
Exhaust Port Shape: Square
Exhaust Port Location: Standard
Spark Plug Style: Straight
Intake Valves Included: Yes
Intake Valve Diameter (in): 2.000 in.
Exhaust Valves Included: Yes
Exhaust Valve Diameter (in): 1.550 in.
Valve Springs Included: Yes
Maximum Valve Lift (in): 0.530 in.
Outside Diameter of Outer Spring (in): 1.320 in.
Damper Spring Included: No
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: 3/8-24 in.
Rocker Arms Included: No
Rocker Arm Nuts Included: No
Guideplates Included: No
Valve Cover Mounting Style: Center and perimeter bolt
Accessory Bolt Holes Drilled: Yes
Valve Guides Included: Yes
Valve Guide Material: Bronze
Valve Seats Machined: Yes
Valve Seat Material: Steel
Steam Holes Drilled: No
Oiling Style: Through pushrod
Machined for O-Ring: No
Heat Crossover: No
Quantity: Sold individually.
Notes: You must use a raised runner design intake manifold or Vortec-style intake manifold for with these cylinder heads.Requires Vortec-style intake manifold for installation.
In-Store Pickup: Choose In-store pick-up (OH, GA, NV) on our web site.

Chevrolet Performance Vortec small port Bowtie cast iron cylinder heads feature revised intake and exhaust ports and are machined for 2.00 in. intake valves and 1.55 in. exhaust valves. The deck surfaces are .450 in. with 66cc combustion chambers, 185cc intake ports, and 65cc exhaust ports. All Vortec intake ports are taller and narrower than early model Chevy heads. The valve cover mounting holes are for both early perimeter-style and late model centerbolt designs. These heads are machined for 3/8 in. screw-in rocker studs, feature large valve spring pocket machining, and will accept up to .530 in. lift camshafts without modifications. They are identified with the Bowtie Emblem on the exterior of the head, below the exhaust flange, and the Vortec logo on top of the intake port area. They also feature the GM logo cast into the bottom of the intake ports.


Some parts are not legal for sale or use in California on any pollution-controlled motor vehicles

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