You must have JavaScript enabled in your browser to utilize the functionality of this website. Part Type: Rocker Arms. Brand: Scorpion Racing Products. Availability: 1 to 5 Days - From Warehouse. These Rockers are lightweight, assuring even greater horsepower, and they are the quietest rocker on the market. They are the only Direct Bolt-on rockers in production. This means no changing of pushrods, guideplates, rocker studs or valve covers are required.
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Image not available Photos not available for this variation. Change country: -Select- Australia There are 1 items available. Postcode: Please enter a valid postcode. The Yella Terra PerfectTune system of roller rockers has never let a competitor down at our high speed proving grounds at the Calder Park Thunderdome.
And we want you to experience that confidence too in our complete line up of Roller Rockers. Street Terra. Yella Terra Street Terra rockers are there to give you the same legendary performance of premium race Yella Terra components at a fraction of the cost. Compared to factory, the Yella Terra Street line up dramatically improves power and performance by giving you the race proven engineering and design of the PerfectTune Yella Terra team for fractions of what you would pay otherwise.
The true roller tip design behind Yella Terra Street Rockers reduces valve side thrust and gives you more life from your valve stems, guides and seats. That means less maintenance and more track time. Keep speed and performance up while keeping temperatures and noise down. Yella Terra Street optimizes the valve train while keeping things cool and quite.
That gives you more performance, easier maintenance, and a longer cylinder head life. Yella Terra Street Rockers set the stage for higher revs with their precision wheel tip rockers and superior trunion mounts and captive bearings. You get the confidence you need to take your engine into the higher rev ranges knowing that the Yella Terra Street rockers are there keeping your valve train hopping while running smoother, quieter, and cooler.
Lifters, pushrods, rocker arms, and springs need to follow suit. Run a spring that is too soft for your camshaft profile and your engine experiences valve fl oat not enough spring pressure to close the valves quickly at high RPM.
This is why running matched components is so important. Rocker arm types range from stock cast affairs all the way up to extruded and forged pieces with roller bearings and tips. Forged or extruded roller rocker arms are quite costly, which generally leaves them out of a budget engine program. An aggressive camshaft profile breaks a stock rocker arm.
Stamped-steel, ballstud, roller-tip rocker arms are a good first step toward valvetrain durability whenever you opt for an aggressive camshaft. The roller tip reduces the stress you experience with stock rocker arms.
Even the best stamped-steel, roller-tip rocker arm will fail when over stressed. When lift and spring pressures go skyward, you want a roller-pivot, roller-tip, forged rocker arm for your budget engine build.
For the weekend racer, stepping up to a better rocker arm is like writing a life insurance policy because marginal rocker arms do not stand up to the high-revving task. Rollerpivot, roller-tip rocker arms also ensure valvetrain precision and accuracy when the revs get high. This is a good mock-up where valve-to-piston clearances and true valve lift are checked using a dial indicator.
These companies all have a lot of valuable experience with valvetrain components and offer wide selections. Always run the same brand of rocker arm and camshaft. When it comes to valvetrain adjustment, Clevelands have flexibility in adjustable aftermarket studs where adjustable studs were not originally used. From to , they received no-adjust, positive-stop rocker arm studs which are undesirable for the performance buff. From to present, the rocker arm stud was replaced with a newdesign, stamped-steel rocker arm, fulcrum, and bolt that mount atop a boss.
Clevelands differ from other small-block Fords in that they never had a studmounted rocker on common examples. Only the Boss and High Output had stud-mounted adjustable rockers. Clevelands were originally fitted with two types of rocker arm packages. Most had this bolt-fulcrum, stamped-steel rocker arm package, which is not adjustable. A Boss or High Output has screw-in studs and adjustable rocker arms with guide plates.
The series small-block engine family C, M, M had two types of rocker arm arrangements from the factory. The Boss and High Output had adjustable, stud-mounted rocker arms.
The rest had bolt-fulcrum style, no-adjust, stampedsteel rocker arms as found on small-block Fords up. However, bolt-fulcrum rocker arms sometimes require pushrods of varying lengths to get into proper adjustment. If you have a noisy rocker arm, confirm lifter status before doing anything else.
A collapsed lifter causes excessive rocker arm noise. According to Ford you are allowed 5 to 55 seconds of lifter leakdown time.
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