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Thread: Spring Rates

  1. #1
    President Member 61Lark's Avatar
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    Dec 2006
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    Andover, MN
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    Spring Rates

    I need to rebuild the front end on my 63 Lark and I'm looking to replace the sagging springs that are in the car now. Does anyone have a list of spring rates for the various springs used in the Larks? I looked in the chassis manual and it just lists parts numbers.

    My car is a R2 automatic that is primarily used for drag racing and is rarely street driven so I'd like to find a spring that would help with launching the car.

    Nick

  2. #2
    Speedster Member
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    Jan 2007
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    waukesha, wisconsin, USA.
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    For drag racing and rise on launch you want a spring with a somewhat low rate but a tall free height as compared to the installed height. This way you have stored energy. You want a standard spring not a HD one. Back in the day (1969) I used 6 cylinder with A/C front coils or it was a standard 6 cylinder spring from a heavier car like a wagon or convertible in my 63 R2 Lark. I think I used a spring from a 64 application because it was available or some 63 part numbers were superseded by 64 part numbers. The part number was either 1561662, 1561664, or 1561665. All I remember was it had about a 17.5" free height. Installed height is about 11.5". Another option is a Buick spring. We have used Moog CC655 or CC653 variable rate cargo coils intended for the rear of front drive GM cars like a 87 Le Sabre on the front of Studebakers as a replacement for the Studebaker HD springs. The stock replacement spring for the Buick is Moog 5711. It is a 200#in coil with a 15" free height. You might need a Studebaker spring spacer on top in order to keep the OE ride height. The car will lean a lot in turns when street driving but it will ride soft. It should give you lift at the drag strip. I also cut about a 1/2" off the rubber snubber that goes on the frame under the upper A arm for a little more travel. I hope this helps.
    james r pepper

  3. #3
    President Member 61Lark's Avatar
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    Thank you, that helps a lot. I've ordered a pair of the Moog 5711 springs to see how they work. If it sits too low I have a pair of the 1/2" spring spacers on hand.

  4. #4
    Speedster Member
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    Let me know how it works out. 90/10 or 70/30 shocks for the front of a 64 - 66 Chevelle and other GM and Ford products will help on launch. 90/10's suck in street driving. 70/30's are better.
    james r pepper

  5. #5
    President Member
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    Morroso Trick Springs are the ticket for drag racing, but are a thrill on the street.

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