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Old 08-23-2012, 04:38 AM
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mickmate mickmate is offline
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Join Date: Sep 2000
Location: Holderness, NH, US of A, NH
Cobra Make, Engine: CSX 4772 old iron FE
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I have attached some notes I have been keeping on these things.

1. Extended length 15 ¼”
2. Compressed length 10 1/8”
3. At normal ride height 12 ¼”
4. Max on car compressed (by jacking one corner) ~11”

Best choices so far:
1. Spax classic adjustable – Spax allows you to “custom build” from stock sizes – (15”/10” w/correct 7/16” top eye & ½” bottom is p/n “K50RV0”) seems like a home run, but Spax has not replied to my requests for where to buy or a price. Not sure if they will reply & probably have to get direct from UK….
2. Koni 30-5325 or 30-5436 (15.75”/10.75”) – not sure about which compression spec. would be better (rebound adjustable) and 10.75 compressed is close to the 11” measured on the car (don’t want it to bottom); ½” top & bottom eye (would have to drill out top mount)
3. QA1 has “circle track” steel body shocks in 15.25”/10.25” sizes, but they are not externally adjustable (sold in different valving specs) – I would have no idea which to pick
The manufacturers should be able to advise you on their shocks. You may have to measure some pivot point lengths etc and know shock angles, weight of front end etc.
The coil over is going to need a different upper arm and mounting as there isn't enough room for it on the stock torsion spring set up.
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