FORD FE 390 V8 1.73 Ratio Pro Street Rockers BALL ADJ (YT 6758A)

Yella Terra adjustable shaft type roller rocker set, to suit the Ford FE 390 engines. These rockers feature specifically designed and ground Modular Shafts with a 1.73 Ratio Rockers

(Includes Cradles, Modular Shafts and Assembled Adjustable Arms with 8.6mm Ball end Adjusters).

Pro Street

Designed for high revving street/strip applications. No other comparable product can compete with 600lbs* maximum open spring pressure whilst retaining factory size bolt-down hardware.

Manufactured and assembled in Australia using the highest quality materials and componentry consistent with those found in our Platinum race series.

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. 

Ideal for harsh street and strip applications, these rockers have got what it takes to last!

Why Choose Pro Street?

• Built to withstand 600lbs* 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.
• 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 circle)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.

ITEM SPECIFICS

NOTES:

• The FE rockers are an aftermarket rocker set for the engine builder & some minor modifications may be needed.  
• Suitable for lower head bolts (max 9mm).
• You need to ensure you have enough clearance between the cradle & the head bolts.      
• As with all higher ratio rockers valve to piston clearance is the responsibility of the engine builder 

WARNINGS:

Ball adjusters are provided as an option only &:

1. Caution needs to be taken when using ball adjusters with cup style pushrods or 3/8 pushrods.
2. It is the engine builder’s responsibility to check high lift geometry not to impact the clearance between cup style pushrods & back of rocker arms.