Can you put a roller cam in a flat-tappet block?
Flat-tappet cam lobes are ground at a very slight angle to prevent the cam from moving. Roller cams cannot be machined this way, so a roller-cam button is employed to limit cam movement.
How much horsepower do roller rockers give you?
With the baseline laid down, we moved on to a set of Comp Cams 1.5:1 roller rockers. At the same 6,000-rpm peak, we made 401.1 hp and 412.9 lb-ft of torque, a gain of 11.2 hp and 5.9 lb-ft of torque.
Can you use roller rockers with hydraulic lifters?
The two don’t necessarily need to be used together. Roller camshafts and lifters can be used in an engine that features nonroller rockers; by the same token, roller rocker arms can be used in an engine that features a flat-tappet solid or hydraulic camshaft.
Do you soak roller lifters in oil?
You want to soak the rollers before installation, not the whole lifter. If you fill the lifter body with oil it just makes it more difficult to initially adjust preload, you have to bleed the oil back out.
How tight should my rocker arms be?
A The rocker arms that actuate the valves in this engine pivot on a special bolt that is threaded into the cylinder head. The bolts should be tightened with a torque wrench to 124 inch-pounds, then tightened an additional 30 degrees of clockwise rotation.
How does the rocker arm work on a roller rocker?
The camshaft controls the valves by pushing up on the lifter, which in turn pushes up on a pushrod. This is where the rocker arm comes into the equation. The valve needs to be pushed down, so the rocker arm works like a teeter-totter to change the upward motion of the pushrod to the downward motion needed to open the valve.
What are the tips of roller rockers made out of?
Factory rocker arms usually have a fulcrum, or pivot, that’s made up of either stamped steel or a bushing of bronze or Oilite. The tips of most factory rocker arms slide slightly across the valve as they go through their motion.
How are needle bearings used in roller rockers?
The tips of most factory rocker arms slide slightly across the valve as they go through their motion. Aftermarket roller arms sometimes replace the pivot with a set of needle bearings and usually put a roller tip on the end that interferes with the valve. The needle bearings have debatable value.
What’s the difference between stock and high ratio roller rockers?
For our first set of tests with the stock head, we compared stock rocker arms with a 1:1.26 ratio to the 1:1.5 ratio roller rockers. The ratios increased the 0.295 inch of lift to 0.372 inch and 0.446 inch, respectively. The high-ratio rocker arms did well at the peaks, picking up about 5 percent more torque and power.