5500 isnt to high on a stock 4.6... on a 5.0, yes...you might even try a little higher.. I I know the 4 valve make the most HP at the higher RPMS...
also, what altitude are you at?
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84 convt,'95 302,AFR's, performer
3.55's, underdrives BBK shorties
stock cam, 1.7's
13.85@102.5
and a '68 stang that WAS nasty ;-)
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