Yella Terra Legendary Alloy 12 Port Head is Back !!
The Yella Terra Alloy 12 port Head to suit the Holden Straight 6 has been reintroduced in the Australian Market with revised port designs that flow over 30%better than factory with much higher flow figures when ported.
Excellent Flow Figures….240 HP potential out of the box
Average of .250′ port wall thickness for custom porting
Over 60% lighter than factroy iron heads
Flow Over 30% better than standard heads
Both Standard Compression and Turbo Versions