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Old 03-09-2009, 06:30 AM
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Valve spring size

I am changing valve springs on an aftermarket set of heads for a hyd. roller cam. I purchased the comp cam beehive springs and noticed when I pulled the origional springs off the the new springs are smaller arround at the bottom than the ones I am taking off. Will this work, once the spring is in place will it stay centered around the valve? The old springs are about 38.88mm and the new ones are about 36.65mm at the base.
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Old 03-09-2009, 01:28 PM
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Quote:
Originally Posted by redride
I am changing valve springs on an aftermarket set of heads for a hyd. roller cam. I purchased the comp cam beehive springs and noticed when I pulled the origional springs off the the new springs are smaller arround at the bottom than the ones I am taking off. Will this work, once the spring is in place will it stay centered around the valve? The old springs are about 38.88mm and the new ones are about 36.65mm at the base.
The spring is either located on the pocket OD or by the upper guide on the ID.
If it fits over the guide and seal if used it should be fine. If it doesn't then the guides will have to be modified or a different spring used.

If these are aluminum heads, a under-spring shim or guide must be used to keep the spring from eating a hole thru the soft aluminum.

Bogie
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Old 03-09-2009, 03:26 PM
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The spring fit over the guide and seal just fine I was just not sure about the dia. of the spring. Thanks for the info!
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