sdd228 brings up a good point...the stock tach is not usually very accurate at higher rpms. So your tach may say 6000 and you are still pulling, but on a mostly stock 5.0, 5400 (actual rpms) is probably the highest you can go before valve float.
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1992 LX 5.0 Convertible Red/Blk
Gears, Exhaust, bolt-ons...
R.H.C. #51
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