Question: How Much Valve Spring?

How much valve spring pressure do I need?

Recommended Spring Pressure

Engine Type Seat Pressure Open Pressure
Moderate Performance Small Block 120 – 145 lbs. 300 – 360 lbs.
High Performance Small Block Up to 425 lbs.
Stock Big Block 130 – 165 lbs. 280 lbs. minimum
Moderate Performance Big Block 325 – 375 lbs.

How much does it cost to install valve springs?

to do a complete job is about $250-$300.00 that is resurfacing, valve job, new valve guides, and install all the valve train parts.

What is valve spring rate?

Spring rate is the force required to compress a spring a specific distance. It is expressed in pounds per inch (lbs./in.). Many people refer to spring rate as “stiffness”. A “stiff” spring will have a higher spring rate.

Can you have too much valve spring pressure?

Yes, too much spring pressure will damage parts. As you have seen first hand. Too much seat pressure will collapse lifters and cause valves to float as well.

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What happens when valve spring tension is too high?

If the spring pressures are too high, the added friction will result in: More heat, Faster valvetrain wear, Potential failure of other valvetrain parts (i.e. rocker arms, pushrods, etc.), and.

Do heavier valve springs add horsepower?

We have done A-B-A engine dyno tests, and you do not lose HP with heavier springs. However, too light (seat pressure) can be VERY bad for the valve train, especially the roller lifters themselves.

How long does it take to replace valve springs?

As far as labor, you are looking at 5-6 hours per side to pull the engine and drive. The labor to pull the exhaust, valve covers, swap the springs, retainers, seals and locks, adjust the valves and replace the covers and exhaust should run about 5-6 hours per engine.

When should a valve spring be replaced?

Valve springs should also be replaced if they are out-of-square. If the spring leans to one side more than about 1/32 inch when placed against a 90 degree square, the coils have deformed and the valve spring needs to be replaced.

How long does it take to change valve springs?

Valve seals are very easy to replace if that is the only problem. If you have an air compressor and a compression gauge hose, or something like it, and a valve spring compressor. Should take you 1-2 hours to replace all 16.

What causes valve spring failure?

What Can Cause Valve Springs To Fail. To maintain correct valve operation at normal engine speeds; all of the valve springs must exert a certain amount of spring pressure. Consequently, too low or week valve spring pressure; may cause valves to not completely seal or float under higher (RPM).

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How do I choose a valve spring?

Selecting a Spring Use only the valve springs that will give the correct spring pressure with the valve both on the seat and at maximum lift. The outside diameter of the recommended valve spring may require that the spring pocket of the head be machined to a bigger size.

What is the purpose of valve springs?

A valve spring is placed around the stem of a valve and held in place by a retainer. Its main job is to control the entire valvetrain, ensuring that the proper amount of spring pressure is applied consistently to prevent valve bounce.

What happens when valve spring tension is too low?

If spring tension is too light, valve float and eventual engine damage can occur. According to cam experts, one of the most common causes of premature camshaft failure is the use of improper valve springs. This can include too high or too low spring pressure, or the springs can just be plain worn out.

Are stiffer valve springs better?

Higher spring rates mean greater force on the camshaft and consequently more resistance to rotation. The flip side to this argument is that stiffer valve springs control the valves better at high speed and provide better prevention of bouncing valves, which can create more power.

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