How much horsepower do roller rockers add?

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.

Do you need longer pushrods for roller rockers?

Proper pushrod length tends to minimize the amount of rocker-tip travel across the valve tip. It’s worth discussing the fact that the rocker tip is actually quite busy across the valve-stem tip. With either too-short or too-long pushrods, the roller tip starts in the wrong position and travels much farther.

Are roller rocker arms worth it?

Besides the potential power benefits of an increase in rocker ratio, roller rockers have several additional power-adding advantages compared with a stamped rocker. The advertised ratio of aftermarket roller-tip rockers is more accurate than the claimed ratio of typical stock stamped rockers.

How much lift do 1.6 roller rockers add?

Increasing the rocker ratio adds lift that could cause the valves to tap the pistons if they were close before. Since an increase from a 1.5- to a 1.6-ratio only nets about 0.030 inch total extra valve lift, and total valve lift is not what you’re checking when you look for PTV clearance, this may not be an issue.

Do roller lifters add horsepower?

The total difference in horsepower between the solid roller and hydraulic roller setup is just slightly over 8 horsepower. In fact, both cams actually made about the same ft-lbs of torque at the same RPM. It means you no longer have to make a choice between solid and hydraulic roller lifter camshaft setups.

Do you need roller rockers with a roller cam?

Roller Rockers. Roller rockers, while offering reduced friction operation compared to conventional rocker arms that pivot on a ball, with direct frictional rub at the valve tip, are not automatically required with the use of a roller camshaft setup.

What happens if pushrods are too short?

The lash created by having too short of a pushrod can cause anything from excess valvetrain noise to component failure of the cam, lifter, or rocker arm. It can also cause damage to the pushrod, valve tip, or even the valveguide.

How do I know if I need longer pushrods?

If the pushrod is too short, the mark will be toward the intake (inboard) side of the valve tip. If the pushrod is too long, the travel will be toward the outboard or exhaust side of the valve tip. An ideal pushrod length will minimize the travel across the center of the valve tip.

Do roller tip rocker arms add horsepower?

Roller tip rocker will give you a 15 to 30 horsepower increase over stock rockers and will give you a more effective valve lift….:yes: Click to expand…

What is the difference between 1.5 and 1.6 roller rockers?

1.5 rockers lift the valve 1.5 times the lobe lift of the cam, 1.6 lift the valve 1.6 times lobe lift. Generally, 1.6 rockers are used to improve the lift of a camshaft that has low lift. They can also be used to get the valve lift into a specific head flow range.

How much lift does 1.7 rockers add?

According to This Article from Hot Rod magazine, a . 1 increase in rocker arm ratio (such as 1.6 to 1.7) will increase lift by about . 030, which would put me right back at the . 542 lift of the X-303, while maintaining the extra duration of the F-303.

Does a cam increase horsepower?

Performance cams increase the duration and timing of the valve openings during the engine stroke, increasing horsepower and making your car accelerate more quickly. You’ll idle slightly rougher with a performance cam, but get a throaty rumble that’s desirable for some gearheads, depending on your vehicle.

What are the specs of a Ford FE 390?

Specs Brand: PCE Part Number: PCE261.1173 Part Type: Rocker Arms Rocker Arm Mounting Style: Shaft Rocker Arm Ratio: 1.76

What kind of rocker system does a Ford FE use?

The factory non-adjustable rocker system is a simple system that works for common street use. The end rockers are unsupported, which is fine for a stock rebuild or mildly built street engine.

What kind of steel is in Ford 390 shaft Mount?

Quality is assured with 40 years experience in the Differential Industry and full involvement in all forms of motorsport from V8 SUPERCAR To Group 1 Drag Racing. We’ll send you an email when Ford FE 390 428 Shaft Mount 1.76 Ratio Stainless Steel Rocker Arms w/ Hardware is back in stock or available for preorder.

Why does the exhaust rocker fracture on a Ford FE?

The factory shaft setup has a tendency to fracture at the head-mounting hole because the end exhaust rocker is unsupported. The mounting hole on the factory pedestals is often larger or oblong in the section below the shaft to allow more oil to reach the shaft.