Pro-Filer Performance Products Big Block Chevy Hellfire X Cylinder Heads 521-X-C43-03

Name: Pro-Filer Performance Products Big Block Chevy Hellfire X Cylinder Heads
Brand: Profiler Performance Products
SKU: PFH-521-X-C43-03
Price: 2842.50 USD
Availability: InStock
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Part Number: PFH-521-X-C43-03

$2,842.50

Pro-Filer Performance Products Big Block Chevy Hellfire X Cylinder Heads

Cylinder Heads, Aluminum, Bare, Valve Job, CNC Ported, 94cc Chamber, 435cc Intake Runner, Chevy, Big Block, Each
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Pro-Filer Performance Products Big Block Chevy Hellfire X Cylinder Heads 521-X-C43-03

PFH-521-X-C43-03

Not Yet Reviewed

Part Number: PFH-521-X-C43-03

Estimated Ship Date from Ohio: Today

$2,842.50

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Overview

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Q&A

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Overview

Brand:

Profiler Performance Products

Manufacturer's Part Number:

521-X-C43-03

Part Type:

Cylinder Heads

Product Line:

Pro-Filer Performance Products Big Block Chevy Hellfire X Cylinder Heads

Summit Racing Part Number:

PFH-521-X-C43-03

Combustion Chamber Volume (cc):

Intake Runner Volume (cc):

435cc

Cylinder Head Style:

Bare

Cylinder Head Material:

Cast aluminum

Intake Port Shape:

Rectangular

Intake Valve Diameter (in.):

2.400 in.

CNC-Machined Combustion Chamber:

Yes

CNC-Machined Intake Runner:

Yes

CNC-Machined Exhaust Runner:

Yes

Combustion Chamber Style:

Heart

Intake Port Location:

Standard

Exhaust Port Shape:

Round

Exhaust Port Location:

Raised

Spark Plug Style:

Angle

Intake Valves Included:

Exhaust Valves Included:

Exhaust Valve Diameter (in.):

1.800 in.

Valve Springs Included:

Damper Spring Included:

Retainers Included:

Locks Included:

Valve Stem Seals Included:

Rocker Arm Studs Included:

Rocker Arms Included:

Rocker Arm Nuts Included:

Guideplates Included:

Valve Cover Mounting Style:

Perimeter bolt

Accessory Bolt Holes Drilled:

Yes

Intake Valve Angle:

Valve Guides Included:

Yes

Valve Guide Material:

Manganese bronze

Valve Seats Machined:

Yes

Valve Seat Machine Style:

5-angle

Valve Seat Material:

Copper

Cylinder Head Color:

Natural

Steam Holes Drilled:

Oiling Style:

Through pushrod

Machined for O-Ring:

Heat Crossover:

Remanufactured:

Quantity:

Sold individually.

Notes:

Best suited for large displacement, high RPM engine applications.Intake port is raised 0.300 in. from stock.

Pro-Filer Performance Products Big Block Chevy Hellfire X Cylinder Heads

Pro-Filer Performance Products Hellfire X cylinder heads are premium, high performance aluminum racing replacements designed specifically for big block Chevy engine platforms. They represent Pro-Filer's top-tier line of 20 degree conventional-port heads, engineered to maximize airflow and horsepower in extreme applications like drag racing and high performance marine setups.

Key technical specifications:

* Valve angle: 20-degree modified valve angle (a flatter angle than the factory 24-degree standard, which significantly straightens the intake path and improves fuel atomization)
* Intake runner volume: 438cc rectangle-shaped intake runners
* Airflow capacity: Capable of flowing over 515 cfm out of the box
* Combustion chambers: 95cc heart-shaped chambers optimized for highly efficient flame travel
* Valves: Massive 2.400 in. intake and 1.800 in. exhaust valves utilizing an 11/32 in. valve stem diameter
* Material: Cast from premium, high-strength A356 aerospace-grade aluminum alloy

Structural and performance highlights:

* 100 percent CNC- ported: The "X" designation indicates that these heads undergo full CNC machining across the intake ports, exhaust ports, and combustion chambers to guarantee precise, repeatable geometry and maximum velocity.
* Conventional configuration: Unlike spread-port designs that require highly specialized custom components, the Hellfire X Series utilizes a conventional big block layout with standard 4.840 in. bore spacing, allowing builders to make massive power without completely altering standard block configurations.
* Heavy-duty valvetrain: Designed to handle severe racing environments, they feature 1/2 in. thick decks to resist lifting under high cylinder pressures. They are explicitly machined to accept premium shaft rocker systems.
* Engine targeting: Optimized primarily for large-displacement, high-RPM big blocks (502 cu. in. and larger) spinning up to or past 8,500 rpm. Major engine builders have successfully utilized these heads to generate over 1,165 hp and 900 lbs.-ft. of torque on naturally aspirated applications.