We offer four stages of performance cylinder heads for naturally aspirated and forced induction engines.

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Stage 1:

(NA Motor)

Cleaning and inspecting cylinder head 

Resurface cylinder head with an RA finish

Radius/5 angle valve job

Pressure testing cylinder head

New Viton valve stem seals

Ferrea® standard size 6000 series valves

OEM Springs

OEM retainers, locators, and keepers

Stage 2:

(NA Motor)

Cleaning and inspecting cylinder head 

Resurface cylinder head with an RA finish

Radius/5 angle valve job

Pressure testing cylinder head

New Viton valve stem seals

New exhaust and intake valve guides (bronze)

Machine spring seat to accept single or dual valve springs

Moderate port and polish

Ferrea® standard size 6000 series valves

Ferrea® valve springs (single or dual option)

Ferrea® titanium retainers, locators, and keepers

Stage 3:

(FI Motor)

Cleaning and inspecting cylinder head 

Resurface cylinder head with an RA finish

Radius/5 angle valve job

Pressure testing cylinder head 

New Viton valve stem seals

New exhaust and intake valve guides (bronze)

Machine spring seat to accept single or dual valve springs

Moderate port and polish

Ferrea® Competition Plus 1.0mm over sized valves

Ferrea® valve springs (single or dual option)

Ferrea® titanium retainers, locators, and keepers

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Stage 4:

(5 Axis CNC /FI Motor)

Cleaning and inspecting cylinder head

Resurface cylinder head with an RA finish

Radius/5 angle valve job

Pressure testing cylinder head

New Viton valve stem seals

New exhaust and intake valve guides (bronze)

Machine spring seat to accept single or dual valve springs

5 axis CNC porting

Ferrea® Competition Plus 1.0mm oversize valves

Ferrea® springs (single or dual option)

Ferrea® titanium retainers, locators, and keepers

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Camshafts

We use Jim Wolf Technology cams for our in-house builds.

Others available upon request

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All cylinder head stages include RA Finishing of the head mating surface. This is a finishing process that ensures the optimal finish for proper sealing of the head gasket. Simply machining the head perfectly flat is not enough. A mirror-like finish is not optimal to proper head gasket sealing. The RA finish puts the right amount of grit onto the surface of the machined head ensuring a proper seal when the heads are torqued down to their proper specification. This process has been proven by many OEM and performance builders to provide the best sealing possible.