Actually, Stephen, its worse than that. in 2000 they brought out the DuraTech 2.3, which makes 143 hp, and bumped the 3.0 power up to 148 by 2004, so then the 3.0 only makes 5 hp more than the 2.3.
Why? well, the 3.0 (49.3hp/liter) is an old school pushrod (OHV) motor with poor head design. The 4.0, in 207hp form (51.7hp/liter) is a SOHC motor with better heads, and the DuraTech 2.3 (62.2hp/liter) is a DOHC design with variable length intake runners. Better technology=better performance.
And to STL, I've never seen a stock Lima beat a 3.0. I have seen D-techs beat 4.0s though. The poor 3.0 doesn't stand a chance against a d-tech, given all other factors are equal.
I got my Jesus on the dashboard, but the Devil's under my hood!