SBC CHEVY SCORPION ROLLER ROCKERS ALUMINUM ENDURANCE SERIES 1.6 7/16 # SCP300
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SBC CHEVY 1.6 7/16 ENDURANCE SERIES ROLLER ROCKER ARMS FULL SET OF 16,
PART # SCP3003
Rocker Arm Mounting Style: Stud
Rocker Arm Ratio: 1.6
Rocker Arm Style: Full roller
Stud Size: 7/16 in.
Rocker Arm Material: Aluminum
Slot Width (in): 0.600 in.
Maximum Spring Diameter (in): 1.625 in.
Quantity: Sold as a set of 16.
THE BEST HIGH PERFORMANCE RACING ROCKER ARMS MANUFACTURED IN THE USA.
Our 427 and 434 engines use the Scorpion Endurance Series rockers, which are the top of the line. We use them instead of the regular Race Series Scorpion rockers because they weigh 496 grams less per set. This is a monumental difference when it comes to valve train weight. They cost more than the regular race series Scorpion rockers, but the increased performance and reduced burden on the valve train is well worth it.
We were amazed at the low level of sound produced in the valve train when we did a test run using our first set of Scorpions. We attribute this quiet operation to the close tolerances in the trunnion section. The trunnion barrels are also micro polished.
The rockers have a lifetime warranty. The aluminum body is made from a 7000 series aircraft alloy. Most rockers have a considerable amount of side play in the trunnion section, and may have an excessive amount of needle bearing clearance. The Scorpion does not have much of a loose feel in the trunnion. Many round track and drag racers run these at very high rpm levels and even run them on solid roller setups. With the milder spring pressures of our engines, these rockers should last a lifetime.
Couple this with the Howards lightweight premium .080 wall push rods that weigh 70 grams less per set than most others, and you have a huge weight savings on valve train components.
The potential for valve float under high rpm is a real issue with most high performance engines using hydraulic roller components. By reducing the weight on valve train components, you also considerably reduce the possibility of valve float as well as wear and tear on the valve train components.
The significant reduction in weight of valve train components will dramatically increase the life of every moving part in the valve train. Since some of our cam choice options are large, and these engines may be driven many miles, we see this reduction in weight as absolutely necessary. The lighter weight components do not reduce the durability of these items; on the contrary, they improve durability significantly. These components are high quality, so the weight reduction in their construction does not compromise them in the least.
All Scorpion Rockers Feature:
Needle Bearing Fulcrum and Roller Tip, Centerless Ground Trunnion, Centerless Ground Pin & Roller, Burr-Free Thru Hole in Trunnion, Large Machined Seat, Thick Walled Adjusting Nut, Pedestals Machined from Solid Steel, Black Oxide Coated Steel Parts, & 100% CNC Machined. Other benefits include:
If you’ve read our warning on engine builders using low grade no-name rods and cranks, a very similar situation exists in the roller rocker market. We do not use or sell off-shore, (no-name) roller rockers, period. They have proven to be faulty in many ways. The center trunnions are not polished, nor is the center of the roller tip true to size or polished. Metal fragments are often left inside the trunnion housing and will cause destruction of the needle bearings. The aluminum alloys used are never aircraft aluminum alloys as are used in all USA made roller rockers. They often mention the alloy as being 6061, and that is a very soft form of aluminum. The 6061 alloy used on these will assure rocker-flex on any higher than stock spring pressures, and this will affect performance. The pins and keepers that hold the parts together are often of poor quality and improperly installed. The front roller will usually scoot along the valve tip, as it can't roll properly due to rough internal surfaces.
We have honestly seen valve tips that were scalloped out due to the front roller dragging across them. This will cause the valves to side-load against the valve guides in the heads and surely cause damage to them if run like this for very long.
We have scrutinized these products in the past and found all of the above problems, and I can tell you there are most likely many more. We would not use them in an engine under any circumstances. You will also see many of these rockers made from stainless on the market. They use a very low grade stainless that actually has a near non-existent amount of nickel in them, but that's not the real problem with them, as stainless steel has no advantage over high grade heat treated steel when it comes to a roller rocker. The lack of hardness of the rocker body is the real problem. The problems with these stainless rockers are the same as mentioned above. These are the roller rockers you see on the market for around $119 and up to $169 for the so called stainless ones. They are pure junk, in our honest opinion. They could possibly be used on a budget back yard stock build up that has a very low spring pressure, with a cam that has very low lift, but then you would be better off with the stock stamped rockers on such a build.
We have heard of many engines using these rockers that came apart and spilled needle bearings into the engine, only to end up in the oil pump. It seems like some engine builders do not care how long the parts in your engine last, or they simply don't know this. I can tell you for sure that using such low grade, "no-name" roller rockers is asking for trouble.
We use Scorpion, Comp Ultra Pro Magnum, and Comp Gold Arc rockers in all of our engines. The difference in these compared to the low grade no-name rockers on the market is huge. Do a Google search on this subject and you will know then what we’re talking about.
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