Yella Terra Platinum Race Rockers - The ultimate performance rockers for Aussie V8's
THESE ARE TO SUIT HOLDEN V8 CYLINDER HEADS WITH LONGER VALVES.
Yella Terra Platinum Race Rockers - The ultimate performance rockers for Aussie V8's
Designed for strength, built to race. No other rocker system compares with Yella Terra Platinum race series. Manufactured and assembled in Australia using the highest quality materials and componentry sourced locally and from the USA.
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.
Proven bolt-on shaft design featuring heavy duty 7/16” and 10mm hardware for stability and durability well beyond the chequered flag.
Features and benefits of the Yella Terra Platinum Race Series Rockers for Holden V8 304 Injected cylinder heads:
Wide Body Arms
- Increases strength and resists deflection at high RPM
- Extruded from aircraft-grade aluminium for optimal rigidity and heat dissipation
High Open Spring Pressure Rating
- Built to withstand up to 900 lbs max open spring pressure
- Ideal for extreme race applications requiring ultimate durability
True Ratio Rocker Options
- Achieve high valve lift without relying solely on aggressive camshaft profiles
- Reduces lifter and pushrod stress, promoting longer engine life
CNC-Balanced Billet Arms
- Enhances valvetrain stability and engine harmony
- Minimizes vibration and uneven wear
Oversize Full-Complement Caged Bearings
- Designed specifically for rocking motion, not just rotation
- Paired with precision-ground trunnions to reduce friction and improve durability
Chrome Moly Steel Roller Tips
- Hardened and ground for smooth valve tip contact
- Reduces wear on valve guides and tips, maintaining valve lash and lowering maintenance
Heavy-Duty Shaft Mount Design
- 7/16” and 10mm hardware increases stability under high loads
- Bolt-on design suits both inlet and exhaust, no cylinder head mods needed
Multiple Ratios Available
- Tailor lift and duration for both stock and performance camshafts
- Allows for fine-tuning of engine performance without camshaft replacement
Use of Longer Valves with Yella Terra Platinum Rockers – Pedestal and Bolt Requirements
When fitting longer valves to a Holden cylinder head, it’s essential to consider the resulting change in valvetrain geometry. The use of longer valves increases the installed valve height, which directly affects the rocker arm’s fulcrum point and alignment with the valve tip and pushrod.
To maintain correct rocker arm geometry—specifically, the angle at which the rocker contacts the valve tip and pushrod—longer rocker pedestals must be used. These pedestals elevate the rocker arm mounting position, compensating for the added valve length and helping to preserve the correct sweep pattern across the valve tip. Improper geometry can lead to reduced valve lift, premature valve or guide wear, and reduced valvetrain efficiency.
In conjunction with taller pedestals, longer mounting bolts are required to ensure sufficient thread engagement and secure clamping of the rocker arms. Standard-length bolts will not provide the necessary engagement depth when used with extended pedestals, potentially leading to loosening or thread damage under load.
For optimal performance and reliability, Yella Terra recommends using appropriately sized pedestals and bolts specifically matched to the increase in valve length when installing their Platinum Series rockers on Holden cylinder heads.
THIS ROCKER SET SUITS SET-UPS COMES WITH LONGER BOLTS AND TALLER PEDESTALS.
ITEM SPECS
| PART NO | YT 6030B |
| MAKE | HOLDEN |
| MODEL | COMMODORE |
| SERIES | VN-VT1 |
| ENGINE | 5.0L|5.7L EFI V8 Applications using "VN" heads |
| YEAR | 03/89|06/99 |
| PART TYPE | ROLLER ROCKERS |
| MOUNTING STYLE | SHAFT MOUNT |
| ROCKER ARM RATIO | 1.65 |
| STUD SIZE | 7/16" |
| ADJUSTABLE | ADJUSTABLE |
| HYDRAULIC | - |
| ROCKER ARM STYLE | FULL ROLLER |
| SHIMS INCLUDED | YES |
| ROCKER MATERIAL | ALUMINIUM |
| SELF-ALIGNING | NO |
| ROCKER ARM BODY STYLE | WIDE BODY |
| ROCKER ARM NUT STYLE | CAPSCREW |
| MAX SPRING DIAMETER | 1.550" |
| MAX OPEN SPRING PRESSURE | 900lbs |
| INLET OFFSET | NONE |
| QTY | SET OF 16 |
| BRAND | PLATINUM |
| NOTE |
To machine for Platinum rockers, remove 0.300" from Rocker Pads, drill and tap for 7/16" UNC. THIS ROCKER SET SUITS LONGER VALVE SET-UPS THAT REQUIRE LONGER BOLTS. KIT COMES WITH 30MM PEDESTALS AND 2 1/2 CAPSCREWS |
EXTRA OPTIONS FOR MODIFIED SETUPS AVAILABLE:
Installation by a qualified mechanic recommended.
- YT 6030 ( Supplied with 2" long 7/16 capscrews and 25mm Pedestals)
- YT 6030A (Supplied with 2 1/4 " long 7/16" cap screws and 25mm Pedestals (Common upgrade for aftermarket alloy heads)
- YT 6030B (Supplied with 2 1/2 " long 7/16" cap screws and 30mm Pedestals
