For the ultimate naturally aspirated 2V Street Thrasher, build the stroker motor using Ford Racing's Boss 5.0 block. Part number M-6010-BOSS50 is a cast-iron Windsor block with a 3.75-inch bore. With the stock 4.6 crank, it makes a 5L engine. Add the stroker package, though, and you've got an LS-killing 5.3 mod motor. You'll be getting up there in price, however, and our rough calculations put this combination at just north of $7,500. For that money, you could have had 32 valves instead of 16.