GM Performance Cylinder Head, Iron, Bare, 65cc Chamber, 225cc Intake Runner, Vortec Bowtie, Chevy,
Part Number:GMP-25534445
GM Performance Cylinder Head, Iron, Bare, 65cc Chamber, 225cc Intake Runner, Vortec Bowtie, Chevy, Small Block, Each (PART #GMP-25534445)
GM Performance Vortec large 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, 215cc intake ports, and 84cc 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.
SPECIFICATIONS |
|
| Brand | GM Performance |
| Manufacturer's Part Number | 25534445 |
| Part Type | Cylinder Heads |
| Product Line | GM Performance Vortec Large Port Bowtie Cylinder Heads |
| Combustion Chamber Volume (cc) | 65 |
| Intake Runner Volume (cc) | 225cc |
| Exhaust Runner Volume (cc) | 77cc |
| Cylinder Head Style | Bare |
| Cylinder Head Material | Cast iron |
| Intake Port Shape | Rectangular |
| Intake Valve Diameter (in.) | 2.000 in. |
| CNC-Machined Combustion Chamber | No |
| CNC-Machined Intake Runner | No |
| CNC-Machined Exhaust Runner | No |
| Intake Port Location | Standard |
| Exhaust Port Shape | Square |
| Exhaust Port Location | Standard |
| Spark Plug Style | Straight |
| Intake Valves Included | No |
| Exhaust Valves Included | No |
| Exhaust Valve Diameter (in.) | 1.550 in. |
| Valve Springs Included | No |
| Damper Spring Included | No |
| Retainers Included | No |
| Locks Included | No |
| Valve Stem Seals Included | No |
| Rocker Arm Studs Included | No |
| 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 |
| 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 | Designed to fit Vortec manifold and early style Bowtie raised runner intake manifold. |
