Valve Spring Diameters

motor-racer_old · August 25, 2009 at 4:29 AM

Can anyone please let me know the dimensions of the original valve springs? Outer diameter and Inner diameter. Have some springs that I'm not sure about. Thanks in advance for any info.

C6ZZKGT · August 26, 2009 at 8:20 AM Official Post

The outer diameter is 1.438. The inner diameter is 1.016 without measuring the inner damper spring. With the inner damper spring it is .952.

-Fred-

motor-racer_old · August 27, 2009 at 1:49 AM

Thanks Fred. Just what I needed to check.

BoS_old · August 27, 2009 at 8:39 AM

To be sure you have HiPo springs you should measure the free

standing height as well. If I don't recall wrong it shall be

2.02" and 1.77" installed.

/Bo

C6ZZKGT · August 28, 2009 at 12:55 AM Official Post

The freestanding dimension on my NOS springs is 2.068. They are also red in color. It is probable that used ones will be shorter.

-Fred-

BoS_old · August 28, 2009 at 7:34 AM

I checked and the book how to rebuild your small-block Ford

says in a table: Free length 2.02" and installed height 1.77".

Sorry, but maybe the information is wrong. I know the load specified

in the book says 83-89 lbs and I have written 93 as the higher value

myself.

Have some NOS but they are the C9 type and the originals should be C3

correct?

/Bo

BoS_old · August 28, 2009 at 7:53 AM

I went to my garage and found the box with NOS springs

and the text says: Valve Damper Spring

C3OZ-6513-A

1 PKG of 8 PCS.

Measured the red marked springs and to me it looks like they are

2.04". Checked the 65 and 66 Shop Manuals and it specifies

a Free Length of 2.04" for the 289 High Performance Engine.

/Bo

C6ZZKGT · August 28, 2009 at 9:20 AM Official Post

I have well over 200 of the C3OZ 6513 A NOS valve springs and I rechecked more of them. I originally only checked the first one out of the box as I figured that they would all be the same. I have found a variance of from 2.040 to 2.068.

-Fred-

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