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Old 12-24-07, 01:20PM   #1
ANDY MITCHELL
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Default Yella Terra Rocker shaft systems for Edelbrock heads $649

Yella Terra Platinum Race Rockers
(made in Australia)

The Platinum Race rockers are designed for the most severe race applications and have the feature of wide body arms for even greater strength and resistance to deflection. All Platinum rockers feature a heavy duty 7/16" mountings for unsurpassed rocker stability.
The Platinum rockers are available in twin shaft versions for Pontiacs in 1.65 ratio to fit Edelbrock heads ONLY,they are available in STD push rod locations and can be used with the following Edelbrock part numbers 60509(This is the Pro Port version and has no intake push rod holes) 87cc bare 60569,87cc complete 60579,72cc bare 60589,72 cc complete 60599 and .250 intake offset for 72cc bare 60509 Pro Port when wanting to make your port wider the stock pusrod location will allow (can be used with the other part numbers but will require filling of the push rod holes)

* Pedestal and Shaft
* Single and Twin Shaft
* Adjustable only
* Solid roller cam and flat tappet applications

Component strength

Yella Terra aircraft quality extruded arms are the strongest made and are matched to massive ground trunnions for superior durability to other brands. Oversize needle roller bearings are used for better load distribution and other hardware features premium quality materials, carefully controlled heat treatment, precision grinding and finishes that ensure reliability, minimum friction and long life.

Easy fit designs
Designed by Yella Terra and imitated by manufactures worldwide, these ingenious shaft and pedestal designs can be fitted in around 1 hour with no head removal or machining required. The Easy Fit rockers offer superior rigidity to stud type rockers thereby eliminating the need for expensive guide plates, hardened pushrods and stud girdles. The additional cost of engine dismantling, head machining, gaskets and assembly costs involved with fitting stud type rockers can often can cost as much as the rockers themselves. These add on costs that do not apply to the Easy Fit designs make them suitable for stock replacement as well as for modified engines and are exceptionally good value for money.Race and street proven
Over 40 years of racing and street products Yella Terra understand what make engines go. We know the performance and rocker technology backwards and with back to back wins at Bathurst and NASCAR and AUSCAR we know the stuff works

Valve train stability
Yella Terra and Street Terra "Easy Fit" shaft and pedestal designs offer the most rigid rocker system without using restraining devices such as guide plates, screw in studs and stud girdles. The result is more consistent valve lift and vastly improved valve train reliability at substantially lower cost.

Component strength
Yella Terra aircraft quality extruded arms are the strongest made and are matched to massive ground trunnions for superior durability to other brands. Oversize needle roller bearings are used for better load distribution and other hardware features premium quality materials, carefully controlled heat treatment, precision grinding and finishes that ensure reliability, minimum friction and long life.

Race and street proven
Over 40 years of racing and street products Yella Terra understand what make engines go. We know the performance and rocker technology backwards and with back to back wins at Bathurst and NASCAR and AUSCAR we know the stuff works

Why are STREET TERRA and Yella Terra rockers not anodised to nice colours?Anodising degrades the aluminium reducing its tensile strength and reducing the life cycle of the arm. An anodised arm is weaker! Anodising is an electrochemical process that produces a clear or coloured coating on the rocker arm. This coating is extremely hard and is "notch sensitive". Even slight "dings" from careless handling or slight scratches like those from feeler gauges can cause a "stress riser" precipitating cracking and subsequent arm failure.

What are the advantages of shaft mount rockers?
Shaft mounting makes the rockers more stable and reliable at high rpm and in many cases results in a significant horsepower gain over stud mounted rockers, where the studs are prone to flexing, particularly where heavier springs are used in performance applications.

By the time you buy some decent Comp or Crane rockers at $475 ARP studs $65 Iski adjustable 3/8 guide plates and a stud girdle $150 you will have spent $755 and still not have something as good and ridged as these shaft systems.

These are not just for racing they are for engines with Hyd/solid flat tappet and Hyd/solid rollers

PricesYT5010 1.65 ratio STD off set $649
YT6370 1.65 ratio .250 intake offset $649

With our ported Edelbrock heads any sestem $599

Kit will be coming soon for the CV1 heads in 1.7/1.7 ,1.75/1.7 and 1.75/1.75
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Last edited by ANDY MITCHELL : 12-24-07 at 01:31PM.
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Old 12-24-07, 02:52PM   #2
Gach
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I'm a little confused, but must admit it doesn't take to much to confuse
me...LOL So what your basically saying is, they come with and off-set
that will work on a "Edelbrock" wide port head. Because I'll tell you the
T&D off set rocker shaft set up ( although is good quality ) sucks big
time in the design department. I had to grind every rocker on the T&D
because they hit the springs, and grind the hell out of the stands
to clear the head bolts, piss poor design, I'm surprise the Pontiac
engine builders never had them correct this problem. Guess what if and
when you have to retorque the heads ( unlike running roller rockers
retorquing the heads is no problem ) you CAN'T!! you have to take
the whole rocker shaft off because you can't get at the bolts/studs
to torques them, readjusts every lifter to boot. Either their desperate
or just don't care.

I'll tell you what, if they ever handed Bob Maxey something like that,
he'd be all over their Sh!t and you can bet it would have been corrected.
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Old 12-24-07, 04:11PM   #3
ANDY MITCHELL
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Gach they will work with like a semi wide port as they have a .250 offset(you need .550 for wide ports),i will be doing some heads to go with these and sell them as a package,i think we will see 345+ CFM out of them with out having to buy a $1200-1500 shaft system.

As for the T&D we have had same problem the Jesel is the same as well we had to mill them to clear head studs so we milled them enough so you can get a socket on the nuts so no need to remove shafts to take the head off.
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Old 12-24-07, 04:31PM   #4
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So back to the Yella Terra Platinum Race Rockers
and CV-1 heads, what spring pressure are they rated
for, how much open pressure can you run, and what rpms are they good for. Others words can you run a .800 lift cam at say 7500-8000 rpms.
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Old 12-24-07, 07:07PM   #5
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Only .800" lift? I'm thinking it's time to turn the wick up to closer to .900" lift and make better use of the heads!
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Old 12-25-07, 08:22PM   #6
ANDY MITCHELL
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Quote:
Originally Posted by Gach View Post
So back to the Yella Terra Platinum Race Rockers
and CV-1 heads, what spring pressure are they rated
for, how much open pressure can you run, and what rpms are they good for. Others words can you run a .800 lift cam at say 7500-8000 rpms.
Yes these rockers will take .900+ lift and 1000+ lbs spring pressure at 8000+ rpm and with fulcrums at .680 and wide bearings they spread the load over more rollers than any regular rocker or even Jesel and T&D with only 1/2" shafts and with more clamping force using the two 7/16 bolts over 3 5/16 bolts(Jesel have gone to ceramic bearings now as another option),but all will do the job and Jesel have other options like roller bearing tips,Mohawk profiling Ect.
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