4.500
something to think about if you go with longer stroke and have TQ monster HEALTHY 565-582 ci street motor..there is a chance your not gonna Enoy it too much cause its gonna blow the Tires off everytime you roll into the gas....i guess you can always put a 200 something gear in it that may help some of that.
i personally lean toward a little more Bore on a TRUE street engine..
just another way to look at things
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "