It is my understanding that valve float is related to the stock springs (on your cylinder heads) not being able to maintain rocker arm stability at high rpms - (basically they can't move the rocker arm between the intake and exhaust ports quickly enough - or at least not properly).
If you go to the Corral website, and do a search for "valve float" in the title of threads, you will see many interesting discussions on the topic.
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1992 LX 5.0 Convertible Red/Blk
Gears, Exhaust, bolt-ons...
R.H.C. #51
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