Yella Terra adjustable shaft type roller rocker set, to suit the Ford FE 390 engines. These rockers feature specifically designed and ground Modular Shafts with a 1.73 Ratio Rockers
(Includes Cradles, Modular Shafts and Assembled Adjustable Arms).
Pro Street
Designed for high revving street/strip applications. No other comparable product can compete with 600lbs* maximum open spring pressure whilst retaining factory size bolt-down hardware.
Manufactured and assembled in Australia using the highest quality materials and componentry consistent with those found in our Platinum race series.
Our wide range of true ratios allows you to achieve high lift without relying solely on your camshaft… a trend many engine builders and racers alike are adopting to relieve the inertia on lifters and pushrods generated by aggressive and often violent ramp rates required to make big lift.
Ideal for harsh street and strip applications, these rockers have got what it takes to last!
Why Choose Pro Street?
- Built to withstand 600 lbs* max open spring pressure
- Oversize full-complement caged bearings designed for oscillating (rocking) loads, paired with oversize precision ground trunnions to reduce friction.
- Intricately balanced CNC billet arms ensuring vital valvetrain stability - focusing attention on the harmony of the entire engine.
- Extruded from aircraft grade aluminium, perfect for dissipating excess top-end heat.
- Proven bolt-on shaft mount design that mounts both inlet/exhaust to common shaft, effectively increasing footprint and clamp load twofold without any further cylinder head modification.
- Various ratios available, catering for every camshaft grind. High ratios allow for additional lift on stock and aftermarket camshafts.
- Chrome moly steel hardened and ground roller tips of generous diameter (positively retained by internal circle)preventing abrasion of valve tips and guides commonly seen with non-roller tip rockers. Allows for smoother, quieter operation. Maintains lash and reduces necessary and tedious engine maintenance.
WARNING:
- These rockers are recommended to a maximum spring seat pressure of 380 lbs.
- Use as a replacement for factory heads with factory lightweight springs.
- Shafts centres must be M8 threads.
- Not recommended with flat tappets/solid lifters
Please note: Requires YT 5132 10mm valve cover spacer.
Also note: Due to inconsistencies in GM castings, these rockers may require clearancing on the heads in the locations pictured.
ITEM SPECIFICS
| PART NO | YT 6758 |
| MAKE | FORD |
| MODEL | FE |
| SERIES | N/A |
| ENGINE | 390 |
| YEAR | N/A |
| PART TYPE | ROLLER ROCKERS |
| MOUNTING STYLE | Modular Shaft Type |
| ROCKER ARM RATIO | 1.73 |
| STUD SIZE | |
| ADJUSTABLE | CUP ADJUSTER SUITABLE FOR 5/16" BALL END PUSHRODS |
| HYDRAULIC | - |
| ROCKER ARM STYLE | FULL ROLLER |
| SHIMS INCLUDED | No |
| ROCKER MATERIAL | ALUMINIUM |
| SELF-ALIGNING | NO |
| ROCKER ARM BODY STYLE | STANDARD |
| ROCKER ARM NUT STYLE | |
| MAX SPRING DIAMETER | 1.55" |
| INLET OFFSET | - |
| QTY | SET OF 16 |
| BRAND | PRO STREET |
| NOTE |
Total rocker system. Includes Cradle, Modular Shafts and Assembled Adjustable Arms NOTE: Requires 5/16" Pushrods |
NOTES:
- The FE rockers are an aftermarket rocker set for the engine builder & some minor modifications may be needed.
- Suitable for lower head bolts (max 9mm).
- You need to ensure you have enough clearance between the cradle & the head bolts.
- As with all higher ratio rockers valve to piston clearance is the responsibility of the engine builder
