Weights are the same, springs are different. 7.5 is the non-smog advance cam.
For that cam, one spring is real heavy wire and the other is a lighter weight
spring. The heavy spring goes on the cam side with the longer slot. The
shorter loop of the heavy spring gets connected to the weight not to the cam
slot.
Happy Memorial Day
Joe
Sent from my iPad
On May 28, 2012, at 1:35 PM, Dana Scribner <dscrib2@hotmail.com> wrote:
> This being Memorial Day I hope everyone has taken the time to thank those
who
> gave their lives so we are able to live ours as we do. I have been having
a
> problem with the idle on my 1969 2000 SU carb no emission car. I can set it
> then go for a ride and when I stop at a light the idle keeps dropping off
it
> 100 or less or it stalls. At high idles it's fine. I gave up and took it
"The
> Guy" wit 40 plus years on SU knowledge. Long story short he thought is is
a
> distributor problem. I opened it up and there it was a broken spring
sitting
> at the bottom. So this leads me to my questions. On the timing lever plate
it
> is marked 7.5; I looked at my supply of parts and some are marked 17.5.
> Why?Are the weights different on the 2 distributors? How do you tell them
> apart?Are the springs different between the one marked 7.5 and the 17.5
> distributor? How do you tell them apart?Where the vacuum advance is
attacked
> to the housing I see the a 17.5 stamped in ink on the 17.5 marked timing
> lever. Are the 7.5 ones not marked?is the vacuum advance different between
the
> 2? Dana S1969 2000
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>
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