HOLDEN 6 IAN MOODY XU1 CAST HEAD 1.6 Platinum Race Rockers 7/16

Platinum Race Rockers

Holden 6 IAN MOODY XU1 CAST Cylinder Heads.

Group Nc racing is a premier category in Australian historic touring car racing, featuring production-based vehicles that competed up to December 1972. This class includes legendary muscle cars like the Holden Torana XU-1, Ford Falcon GT-HO, Chevrolet Camaro, and Chrysler Charger, all built to strict period-correct specifications while allowing limited performance enhancements. Yella Terra has been a trusted name in the racing scene for decades, supplying top-quality valvetrain components to keep these classics performing at their best.

Continuing this legacy, Yella Terra has developed its latest rocker system in conjunction with respected Western Australian engine builder Peter Clark, specifically for the Holden Moody XU-1 cast cylinder heads. This cutting-edge rocker system delivers superior reliability, efficiency, and power, giving Group Nc racers a true performance advantage on the track.

The Moody XU-1 cast cylinder head is a high-performance aftermarket component designed for Holden 6-cylinder engines, particular those in the Torana XU-1 models. Developed by Ian Moodie, this head offers several enhancements over the original cast iron heads.

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” hardware for stability and durability well beyond the chequered flag.

Why Choose Platinum?

• Wide body arms for greater strength and resistance to deflection, extruded from aircraft grade aluminium for the highest RPM potential. Built to withstand 900lbs* 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.
• Single shaft bolt-on also available for cantered valve cylinder heads.
• 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 circlip)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.

Tech Spec - *NOTE* Also Available in 1.8 Hi-Ratio - YT 6819 / Enquire through Peter Clark