Name: Yella Terra Holden 304 / 5.0L EFI V8 Platinum 1.75:1 High-Ratio Shaft-Mount Roller Rockers — YT 6767
Brand: Yella Terra
SKU: YT 6767
Price: 1550.00 AUD
Availability: InStock

Yella Terra YT 6767 Holden EFI V8 Platinum 1.75 high-ratio rocker arms

Yella Terra Holden 304 / 5.0L EFI V8 Platinum 1.75:1 High-Ratio Shaft-Mount Roller Rockers — YT 6767

$1,550.00

Yella Terra’s Platinum 1.75:1 high-ratio shaft rocker set is a race-oriented valvetrain upgrade for Holden EFI V8 engines using VN-style cylinder heads. The higher rocker ratio increases valve lift without relying entirely on more aggressive camshaft lobe lift.

Platinum high-ratio construction

Set of 16 adjustable full-roller aluminium rocker arms.
High 1.75:1 rocker ratio.
Wide-body aircraft-grade aluminium arms for high-RPM stiffness and resistance to deflection.
Supplier technical table lists less than 900 lb maximum open spring pressure.
Oversize full-complement caged bearings with precision-ground trunnions.
Hardened chromoly roller tips.
Supplied with 2-inch 7/16-inch capscrews and matching pedestals.
Maximum spring diameter: 1.550 in.
Shim set included.

Supplier warnings and machining

Yella Terra separately states a maximum recommended spring seat pressure of 380 lb for this application; seat pressure and open pressure are different measurements and both limits must be respected.
Remove approximately 0.300 in from the rocker pads and drill/tap the mounting points to 7/16-inch UNC.
Requires Yella Terra YT 5132 10 mm valve-cover spacer.
Yella Terra notes localised head clearancing may be required because of casting variation.

Application: Holden 304 / 5.0L EFI V8 combinations using VN-style heads. Because this is a high-ratio rocker, verify final valve lift, retainer-to-seal clearance, pushrod geometry and piston-to-valve clearance before operation.