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Anyone using them? Any good? This is for a turbo application. They are about 2/3 the cost of another brand....why?

Need something with 250# seat/600 open & good to .680" lift. 1.550"

-Carm
 

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I have used them on basic stuff. Have I used better that are not expensive? Sure. I have to ask though, how much boost and rpm? Type of valves and sizes? Is this a street engine or a race engine? There is a big difference when it comes to springs and you often get what you pay for. It is not just based on spring pressures so I wouldn't skimp on them. If this is a race engine with alot of boost and rpm, I would go alot stiffer in pressures...Not telling you what to do, just offering some advice.. Wouldn't want you to waste money or hurt this thing.
 
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