Name: Yella Terra GM LS1/LS2 Ultralite 1.7:1 8mm Shaft-Mount Roller Rockers — YT 6645
Brand: Yella Terra
SKU: YT 6645
Price: 950.00 AUD
Availability: InStock

Yella Terra YT 6645 LS1 LS2 1.7 Ultralite shaft roller rockers

Yella Terra GM LS1/LS2 Ultralite 1.7:1 8mm Shaft-Mount Roller Rockers — YT 6645

$950.00

Yella Terra’s Ultralite shaft-mount roller rocker system is a lightweight factory-replacement/street upgrade for GM LS1 and LS2 engines. This version uses a 1.7:1 rocker ratio with the factory-style 8 mm shaft mounting.

Ultralite design

Set of 16 full-roller aluminium rocker arms.
Supplier-rated to 400 lb maximum open spring pressure.
Approximately 50% less oscillating nose weight than the factory rocker system.
Oversize full-complement caged bearings and precision-ground trunnions are designed specifically for oscillating rocker loads.
Aircraft-grade extruded aluminium arms reduce moving mass and help dissipate top-end heat.
Hardened chromoly roller tips reduce valve-tip and guide wear.
Common-shaft inlet/exhaust mounting increases clamp footprint and valvetrain stability.
Maximum spring diameter: 1.437 in.
Hydraulic operation; not recommended for flat-tappet or solid-lifter use.

Clearance requirements

Yella Terra specifies a maximum recommended spring seat pressure of 380 lb for this Ultralite application.
Requires Yella Terra YT 5132 10 mm valve-cover spacer.
Due to variation in GM cylinder-head castings, localised head clearancing may be required. Clearance must be checked during installation.
Shaft centres must retain the applicable M8 mounting threads.

Installation: Verify pushrod length, rocker geometry, spring/retainer clearance and piston-to-valve clearance for the complete engine combination.