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But Im sure you can safely run some of those kits on your car, if you are aware of it will put more presure on the rest of the components, if you buy a kit like this you should check up the engine very carefully before installing and do a complete service on it bearings and gaskets might be wise to look over/change before instaling, if available get reinforced bearings.....
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approx 7psi is quite acceptable on engines runing a compression artio of around 10.5 or less.
on a big v8, id expect a hp gain of around 50-80 ponies... of course, my direct opinion is that all engine tuning needs to be performed on a dyno to correctly determine the dynamics of various settings, and engine managment.