No hassle
returns
Live in-stock
inventory
Save over
60% retail
You have no items in your shopping cart.
June Sale: $5,945.10
In Stock
May ship from manufacturer
Free Shipping
Part number: SB8010
Product Details
Cosworth SB8010 Big Valve Cylinder Heads

For over 40 years, Cosworth has been the leader in innovative multi valve cylinder head design for both racing and high performance production cars. The Cosworth CNC Ported Big Valve Cylinder head range is the latest advancement. Modified from new OE cylinder head castings, substantial gas flow improvements and upgraded valve train components offer superior performance for your high performance engine.

Each original cylinder head design is carefully evaluated and tested to establish the improvements required to meet the target performance level. Hours of testing and flow bench validation are used to determine the best advanced port design yielding maximum usable power and response. However, there is more to cylinder head design than just maximum flow. It is critical that port velocity is maintained to ensure drivability and valve train components are matched to guarantee reliable performance. Once all of these factors have been tested and validated, the final port contour is digitized. Using the digitized program, we then reshape both intake and exhaust ports using a 5 axis CNC mill producing an accurate and consistent port shape every time. In addition to reshaping and enlarging the intake and exhaust ports, most Big Valve Cylinder heads feature a re-shaped combustion chamber to un-shroud the valves increasing air flow and performance. After machining, each cylinder head receives a multiangle high performance valve job on our precision CNC valve seat cutter. Then each cylinder head is ultrasonically, cleaned, serialized and then hand assembled with select high performance valve train components, ready to install on your engine.

Key Features

  • All New OE Castings
  • Enlarged Intake and Exhaust ports
  • Large diameter stainless steel intake valves
  • Large diameter Inconel exhaust valves
  • Hi Rev, Dual valve springs
  • Titanium Retainers
  • Hardened Steel spring platforms
  • Reshaped combustion chamber on most applications
  • Flow bench proven design
  • Dyno tested
  • Machined Cosworth Logo
  • Precision Multi angle valve job
  • Pre-assembled, ready to install
  • Machined port bore finish
  • Knife edge port divider
Reviews
Add your review
G
Ordering was very easy, and the part shipped right away. Will use autoplicity again without a doubt.
L
Great price on my item. Order placed and shipped from manufacturer very quickly. Anxiously awaiting delivery.
J
good service
M
First time buyer.  Ordered Sunday. Shipped out Monday.  Fast Shipping.  Good prices.
Show All Reviews
Fitment
Subaru Impreza
2006 Subaru Impreza WRX STI
2005 Subaru Impreza WRX STI
2004 Subaru Impreza WRX STI
Return Policy
Returns are easy at THMotorsports
Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy