At first, the 2003 Vulcan doesn't look all that far removed from the '02 bike. But after a couple of laps around its longer and lower streamlined perimeter, it's clear the VN1600 Classic inherits little from the VN1500 parts catalog. Basic engine architecture is the same, but 5mm more stroke bumps the fuel-injected liquid-cooled eight-valve V-twin's displacement from 1470cc to 1552cc. Cylinder sleeves are 5mm longer, also, but heads and pistons remain status quo. Higher-lift cams aim to fatten low-to-midrange torque.