Keeping the stock stroke of 3.00" you can bore the cylinders to:
.030" over to make a 306 cu in or
.040" over to make a 308 cu in.
I personnally haven't seen anything greater than a .040" over bore on a stock block. It may be possible, but I'm not sure who would make a piston for anything greater than 4.040". Plus, the more you bore the less material between the cylinders which means a weaker block.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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