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I don't know about that, but I would stick with Crower's on the springs. Crane's have been known to break, where Crower's don't seem to.
I get my Crower's from here;
http://www.raceeng.com/p-7072-valve-springmitsu-4g63.aspx
Don't worry about the 4g63, they work on the 420a.
Which brings me to the next point of using stocker 4g63's. I never found the comparison strengths on our's vs the 4g63. But I figured that they would be stronger, so I used them on my current turbo build, lol. Captain Caveman
96 RS Turbo 11.414 @ 119.62 MSNS, Crower 2 NA cams, BW366, 10.5 comp, UDP, 60mm TB, W/A intercooler, 3.55 tranny 567.9whp 430tq 97 RS NA 13.188 @ 103.87 MSnS powered 12.5 comp, Crower 3's and 219.4whp with 175tq 98 RS DD 12.5 comp on stock ECU, LTH, Crower 2's, Koni, GC, Hypercoil, DG hats 99 OZ 5sp Stocker 15.856 @ 85.97 99 GS stocker auto 17.7@77mph!
wiki home page:http://www.2gnt.com/index.php?d=bullettdsm
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