Hellfire X 20° CNC Ported
438cc BBC Cylinder Heads
Series P/N: 521-X-C43-03
- 100% CNC Ported for over 515cfm flow!
- 438cc Intake Runner
- 20 Degree Valve Angle
- 95cc Heart Shaped Combustion Chamber
- 2.400 Intake & 1.800 Exhaust Valves
- 11/32" Valve Stem Dia
The Hellfire 20 degree cylinder head is the first in the New Hellfire Series from Profiler Performance. The new Hellfire Cylinder Heads start with the latest in casting technology and then incorporates the most advanced CNC machining technology to create the most powerful 20 degree available.
The Hellfire 20 degree cylinder features a 438cc intake runner and a 93cc combustion chamber. This 20 degree head will flow over 515cfm.
The Hellfire cylinder head is available as a porter casting for those shops that want to use their own port design.
Details
Series P/N: 521X 438cc BBC Hellfire X Head Specifications
| Material: | Aerospace Specification, A356 Aluminum Alloy (Primary Virgin Ingot) |
| Valve Angle: | 20° valve angle |
| Intake Port Volume & Shape: | Rectangle-Shaped, Fully CNC Machined 438cc |
| Intake Port Flow: | Over 515cfm |
| Exhaust Port Shape: | Round, Raised Port, Fully CNC Machined |
| Combustion Chamber: | CNC - 95cc |
| Valve Spring Pocket: | Maximum of 1.625" (no deeper) |
| Bore Spacing: | Standard BBC 4.840" |
| Valve Diameter | Intake - 2.400", Exhaust - 1.800" |
| Valve Stem | 11/32" |
| Valve Length: | Intake 6.010", Exhaust 5.930" |
| Deck Thickness: | 1/2" |
| Valve Guides: | Manganese Bronze to assist in extending valve life |
| Valve Seat: | 55° - Copper Alloy |
| Valve Train: | Uses Jesel or T&D (T&D P/N 3142) |
| Spark Plugs: | Revised location to improve flame travel. Machined for a gasketed 3/4" reach plug NGK R5671A-7 or colder |
| Head Bolts: | Requires 1" longer head bolt next to exhaust ports |
| Accessories: | Heads drilled and taped for standard accessories (alternator mount holes) |
| Engine Size: | 438cc - 502cid + /8500 rpm |
| Application: | High Performance (i.e. strip / marine) |
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