79 Buick Regal 360ci sbc 13.70 @102 n/a so far
97 Trans Am WS6 LT1 11.94 @112.26 n/a with a 1.603 60ft
04 Mustang GT Bolt-ons 13.35 @102.43 n/a more parts soon
04 SRT-4 20g and bolt-ons 13.28@110 with a 2.21 60ft best mph run 13.42@113.5 with a 2.37 60ft on just 20psi
i dont see why not, retainers are needed when reving high. ive used crane springs with stock retainers
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You can, modern sells the springs alone. they're around $75, alot better than 250 for more than you need. I saw somewhere on this site that the retainers are good up to 7200 i think. unless you're running an ems, you're limited to the 7000 that most flashers go up to.
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Stock retainers can work well beyond the 7200rpm range but it's about proper valve control at rpm that matters in a competition setting. High lifts, plus the heavy weight of stock cromoly retainers (compared to Ti retainers) make the valve springs have to work harder, and you can get move valve bounce and less valve control. Again, at high rpms. Not to mention reduced wear on the valvetrain.
these are my observations over the years, I would say that if you are running a cam that is ~3.400"lift or higher, and/or running beyond the 7200-7500rpm+ range on a regular basis, Ti retainers and dual valvesprings are the way to go. Also an oil modifier such as Realtune's is a very good option too.
$.02
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