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Yella terra rockers sbc mods#
Yella terra rockers sbc plus#

Yella terra rockers sbc plus#

From Rocket in Sydney, a quoted price in 2004 was $766-20 plus freight.Ĭompatible pushrods are an extra cost item. In Australia the FOB price from Yella Terra was $834-#895 AUD in 2004. Oiling is provided in the normal way, but oil is fed to the individual rockers from the top of the shaft so that it will run down & lube ALL of the needles.

High strength alloy rocker arms that are as much as 5 times the strength of stock units.

Pushrods need to be changed to "standard" type pushrods.

Yella terra rockers sbc mods#

No mods to head required (but YT sales said custom machine work is needed).

Rockers are longer and pedestals are in orig position.

Shaft is hardened steel (main pedestal shaft that is) - this is a larger diameter than stock.

YT6023 1.55 ratio (kit: includes rockers, shaft & pedestals).

They weigh 10g more than standard rockers, but have improved friction properties so should allow higher revs-if the valve springs allow it. The roller rockers come in 1.54:1 or 1.65:1 ratios (stockers are 1.44:1). Yella Terra sells roller rockers to fit Nissan A-Series engines. Post click for topic Post click for topic Putting in decent pushrods makes a huge difference in the effective lift at high rpm. Reportedly, stock pushrods bend excessive at RPMs higher than stock (the A12GX Engine has a 6600 RPM redline).

Possibly you will need special valve springs, especially if the rockers have a higher-than before ratio.

This rocker cover is made from two joined together to clear the roller rockers You can use a high-profile allow cover or a customized rocker cover if necessary.

Rollers are usually a lot bulkier, and may hit the rocker covers.

Custom-length Pushrods will undoubtedly be required or you'll end up with an engine that goes bad or makes excessive noise and won't rev any higher.

Like most custom valvetrain parts, fitting these requires precise measurement and assembly.

The ratios should not compete with the camshaft. Consult with your cam grinder before you do this. You can option them in mixed sets if you want different inlet and exhaust ratios.

High RPM speedway mini sprinter engines with A12s that run at 10,000 RPM use roller rockers fairly commonly. They are only significant however for high-rpm or high-lift camshift-fitted engines. Roller rockers are about $750 AUD, camshaft $150+ Springs $120.Ĭan you use roller rockers on street cars? Yes, many new cars use them for slightly increased fuel economy. Even some race engine builders after experimenting with rollers have gone back to the bulletproof stock-type rockers. We feature Yella Terra Platinum Twin Shaft Rocker Arms at low everyday prices.On the other hand, there is nothing wrong with stock-type rocker arms. The Yella Terra Platinum Twin Shaft Rocker Arms are for small block and big block engines. All Platinum rockers feature a heavy duty 7/16" mountings for unsurpassed rocker stability. The Yella Terra 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.

Racers use Yella Terra Rockers because they work well and are reliable. Yella Terra Rockers are made in Australia to high quality design standards to meet a demanding market place. Yella Terra Rockers have proven themselves over the years in use, a high quality product doing a tough job and making it look easy. Yella Terra Platinum race rockers are for the most severe race applications. Yella Terra products are hard core, suited to racers, motor heads and enthusiasts who want to nail it off the line, and marine junkies who like to wind it out on the water, and know that the parts they have chosen will do the job. Pit Stop USA is The Online Motorsports Superstore! Yella Terra has been making hi-performance products that have been winning championships, lowering ETs, increasing MPHs and burning up tarmacs for more than 45 years.