These have been in testing for 6 months and we finally able to release them. Entire kit was designed and engineered by Ferrea Racing
Good up to .650 lift with stock rockers
Valvetrain is stable up to 8,000rpm and 65psi
An FEA analysis was performed on the factory rockers after being subjected to 8,000rpm and .650 lift with no additional wear. The valves are Ferrea Competition Plus, easily the best valves on the market today. The springs are made by Pac Racing specifically for Ferrea to use with this valvetrain. Retainers are titanium and the locks/locators are machined and hardened. These components will be used in our new Stage III cylinder heads for $2695. With the larger camshafts we can use, these new Stage III heads/cam packages will make another 25-35rwhp over our current offerings.
The valves are slightly longer than stock due to geometry issues. When the rocker pad stops rolling and starts to drag, that’s when you get valve tip failures, not to mention excessive rocker pad wear. So we are going with a longer valve length to start the initial travel path earlier on the rocker pad radius. This will allow for greater valve lifts. We then calculated the dual valve spring install height and placed the single radial groove where the clearance between the rocker belly and the top of the Ti retainer will not rub.
This is our current Stage III setup:
Intake Valve
Head Dia: 2.100”
OAL: XXXXX
Tip length: .XXXXX
Exhaust Valve
Head DIa: 1.600”
OAL: XXXXX
Tip Length: XXXXX
We also be offer 2.125/1.625 size valves for customers who are looking for every bit of hp available.
For racing applications: PAC Alloy Dual Valve Spring
(Pressures measured with a retainer step and seat locator thickness of .060”
Seat Pressure: 160 lbs @ 1.715”
Open Pressure: 450 lbs @ 1.115”
Coil Bind: 1.030”
Linear Mode
