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Old 06-24-2010, 10:03 PM
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Valve spring diameters

ok so the heads i purchased (from neighbor) came with valve springs measuring 1.56 outer-diameter and they look like they fit in there perfect. however the camshaft im ordering calls for different springs and they measure 1.43 outer-diameter, so the question is will the diameter difference be ok? i've tried looking for springs with the same diameter and the right spring rate, but have had no luck. let me know if anyone can help! Thanks

Another question is when "breaking in" a flat mechanical cam is it totally neccesary to take inner springs out? looking for honest opinions

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Old 06-24-2010, 11:12 PM
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What is the difference in rate between the spring you have and the recommended spring??

Not removing the inner springs for break-in is playing with fire. Are you lucky enough that you can pick the Lotto winning #'s every week??

Last edited by ericnova72; 06-25-2010 at 01:02 AM.
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Old 06-25-2010, 12:55 AM
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Quote:
Originally Posted by 65malibuSS
ok so the heads i purchased (from neighbor) came with valve springs measuring 1.56 outer-diameter and they look like they fit in there perfect. however the camshaft im ordering calls for different springs and they measure 1.43 outer-diameter, so the question is will the diameter difference be ok? i've tried looking for springs with the same diameter and the right spring rate, but have had no luck. let me know if anyone can help! Thanks

Another question is when "breaking in" a flat mechanical cam is it totally neccesary to take inner springs out? looking for honest opinions
It's hard to formulate an answer for you when you withhold detailed information about the heads and the cam.

There is no such thing as giving out too much information when you're asking for help.
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Old 06-25-2010, 09:24 AM
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i would gladly give more information the heads are canfields 220cc (65cc) with oversized valves and shaft mounted 1.6 rockers, the cam is

http://www.summitracing.com/parts/CCA-SK12-677-4/

and the question was about going from a bigger diameter spring to a smaller diameter- 1.56 down to 1.43?

if you needs more information let me know! thank you
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Old 06-25-2010, 09:39 AM
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Quote:
Originally Posted by 65malibuSS
i would gladly give more information the heads are canfields 220cc (65cc) with oversized valves and shaft mounted 1.6 rockers, the cam is

http://www.summitracing.com/parts/CCA-SK12-677-4/

and the question was about going from a bigger diameter spring to a smaller diameter- 1.56 down to 1.43?

if you needs more information let me know! thank you
You first need to know what the spring installed height, spring pressure on the seat and at full lift is called for, for your cam.

Then you need to compare that value to the springs that are now on the heads.

There is no way to compare springs based solely on their physical dimensions.
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