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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

Estimated Ship Date: 1/15/2015 (if ordered today) Would you rather pick it up? Select Location

  • Order this item and get free delivery and handling on your entire order! Oversize fees also waived on this item. Valid on orders shipped in the contiguous United States.

Brand: Chevrolet Performance

Manufacturer's Part Number: 25534421

Part Type: Cylinder Heads

Product Line: Chevrolet Performance Vortec Small Port Bowtie 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.

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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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