Quote Originally Posted by ff_jeff View Post
Not really. A cammed full bolt on 5.3 will always put out less than the same setup on a 6.0 you could probably get another 50hp out of the extra cubes.
a 4.8 to 5.3 would be marginal, but noticeable. 5.3 to 6.0 would be night and day. As long as the 6.0 was healthy.
theres a few 5.3s making more power then 6.0s. its all in how the parts are chosen.