Cylinder Head Packages
Stage I Cylinder
Head Package:
(SOHC)
$3048.42US
+ Shipping,
(DOHC)
$2910.91US
+ Shipping
- Disassembly and cleaning
- Port refinishing and bowl contouring
- Custom 5-angle Valve Seat Machining
- Hand Blending of the Port/Valve Seat Juncture
- Combustion Chamber Cleaning
- Valve resurfacing using the ‘center-less’ method
which also measures the stem and head run-outs to 0.0004”, Valves
are replaced if this run-out is exceeded
- Milling of the cylinder head (depth is
appropriate for application and combustion chamber work)
- Camshafts (DOHC Stage I, SOHC Stage II)
- Heavy Duty Valve Springs (SOHC only)
- New Subaru Valve Seals
- New Subaru Cam Seals
- Assembly of the Cylinder Head
- Setting of the Valve Lash
Stage II Cylinder
Head Package:
(includes above plus the following:)
(SOHC)
$3846.22US + Shipping,
(DOHC) $4144.37US + Shipping
- Exhaust port balancing
- Graduated intake port finishing
- Exhaust Port
polishing
- Combustion Chamber modifications, measurement and
matching of combustion chamber volumes, polishing, and valve
un-shrouding
- Heavy Duty Valve Springs (both SOHC & DOHC)
- Titanium Retainers
Stage III Cylinder
Head Package: (includes
above plus the following:)
(SOHC)
$5180.42US + Shipping, (DOHC) $5951.65US + Shipping,
(STI EJ257)
$6457.54US + Shipping
- Intake port redesign
- Extensive exhaust port modifications
- Flow bench testing
- Stage III Camshafts replace previous stage
-
SOHC Rocker shaft
saddle machined to correct valve train geometry
- Shim Under Bucket Kit (DOHC)
*Note1: All Cylinder
Head Porting is custom tailored to the individual customer needs.
*Note2: Porting for Turbocharged and Supercharged applications have more
significant modifications performed on the combustion chamber and
exhaust ports, while less work is done on the intake ports so as to
properly balance flow.
*Note3: From our experience, even brand new OEM valves have too much
run-out for our liking. We recommend using our Stainless Steel
swirl polished performance valves which are OEM sized in place of the
OEM valves for extra peace of mind.
*Note4: All cylinder head packages are subject to a core charge of
$800.00US per pair; this is refunded to you upon receiving your stock
heads in good usable condition.
Additional Options:
- Stainless Steel
Swirl Polished Intake/Exhaust Valves - $399.00US
- Inconel Exhaust Valves (recommended for Turbo
applications) - $1198.06US
- Titanium Intake Valves (recommended for high rpm
applications) - $1633.72US
- Manganese/Bronze Valve Guides (recommended for
Turbo applications) - $364.52US
- Ceramic Coating on Combustion Chamber
(recommended for Turbo applications) -
$571.80US (includes #29 &
#30 options)
- Ceramic Coating on Valves (recommended for Turbo
applications)
- Ceramic Coating on Exhaust Ports (recommended for
Turbo applications)
- Adjustable Cam Pulleys (recommended for racing
applications) - $116.00US (SOHC), $232.00US (DOHC)
*Please
note these will only be sold to experienced engine builders, cam
degree-ing on the boxer layout is extremely tricky and should only
be left in the hands of the experienced.*
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