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Roller Rocker Sets

ROLLER ROCKER APPLICATION GUIDE

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The best value rocker arm on the market today. Engineered to meet or exceed the needs of performance street and sportsman race applications running a maximum open valve spring pressure of 450lb. Designed and engineered for optimum strength, the Street Terra vacuum die cast roller rocker features the extreme duty hardware from our premium Platinum series, including oversize ground trunnions and needle roller bearings, ensuring years of trouble free performance and durability. 

No comparable product can claim this combination of critical features. Available in both traditional stud mount designs, for use with pushrod guide plates and rocker studs, and our unique “EASY FIT" ef.png bolt-on sets that can be fitted in about one hour with no head removal or machining required. Street Terra ™ EASY FIT ef.png kits are also a cost effective replacement for factory stamped steel rocker arms on standard or mild street engines.

Mounting Types: Available in Stud Mount and Easy Fit ef.png

Maximum Open Spring Pressure: 450lbs

Lifter Compatibility:   Hydraulic Easy Fit ef.png kits are designed specifically for use with hydraulic lifters.  

                                   Adjustable kits are designed for use with both hydraulic and mechanical (solid) lifters.

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Late model V8 and V6 engines that run factory light weight valve train components, are often subject to valve float in the upper RPM range, limiting the engines performance and full potential.  Yella Terra’s engineering team set out to find a solution to the problem, and the result was the Ultralite.

Yella Terra’s exclusive Ultralite rocker arm, shaft and pedestal  system offers 50% less nose weight than the factory rocker system, the result being greater RPM potential, with the added advantage of improved strength and durability. 

Available in standard rocker ratio or high ratio options, to suit a number of late model engine applications.  

Mounting Types: Easy Fit ef.png

Maximum Open Spring Pressure: 400lbs

Lifter Compatibility: Hydraulic Easy Fit ef.png kits are designed specifically for use with factory hydraulic lifters. 

Pro Street

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Featuring aircraft grade, extruded aluminum rocker arms that will handle open spring pressures up to 600lbs*, the Pro Street range has been designed for use in high revving street engines and race applications. 

The Pro Street rocker arm is supported by the same hardware used in our severe race Platinum series, including including massive ground trunnions that have been machined to accommodate oversize needle roller bearings. The ground finish on our trunnions offers smoother operation, lower friction and better bearing compatibility than the machined finish used with comparable products.

Available in traditional stud mount and “Easy Fit” ef.png applications, to suit various stud diameters and a wide variety of ratios. 

Mounting Types: Available in Stud Mount and Easy Fit ef.png

Maximum Open Spring Pressure: 600lbs*

Lifter Compatibility: Hydraulic Easy Fit ef.png kits are designed specifically for use with hydraulic lifters. 

                                 Adjustable kits are designed for use with both hydraulic and mechanical (solid) lifters.

* Due to various engine rocker arm designs, some applications may handle more open valve spring pressure than others. For more details, please contact our Tech Department.

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Some years ago, we set out to create the world’s strongest roller rocker, with the highest RPM potential, and the successful result was the Platinum series.

Engineered for the most severe race applications on the planet, Platinum rockers feature “wide body” arms for even greater strength and resistance to deflection. Capable of handling open spring pressures in excess of 900lbs, all platinum rockers feature heavy-duty 7/16” mountings for unsurpassed rocker stability.

Platinum rockers are available in twin shaft versions for parallel valve applications and unique single shaft designs for canted valve cylinder heads. The Platinum range covers most popular factory and aftermarket performance heads in a choice of ratios and offsets. 

Mounting Types: Available in 7/16” Stud Mount and 7/16” Pedestal Mount. Heads must be machined to accept 7/16 UNC thread.  

Maximum Open Spring Pressure: 900lbs+ *

Lifter Compatibility:   Designed for use with both hydraulic and mechanical (solid) lifters.

* Due to various engine rocker arm designs, some applications may handle more open valve spring pressure than others. For more details, please contact our Tech Department.

Please contact our support staff with an "ENQUIRY" in regards to fitting instructions/directions.