Quote Originally Posted by Wagonbacker9 View Post
Totally depends on your setup.. rod length, displacement, combustion chamber CCs...

As for changing the springs, I just got into this debate in another thread, there is nothing stopping you from changing the springs with the heads on the block. And there are plenty of stalls out there that are fine for towing, as long as you have a good cooler.
Right. I just read where super chevy did a port and polish job on a set of 5.3 heads and got almost 40hp gain. So i just thot i might do it all at once. But the truck came from the factory in 1994 with a towing package so it has a cooler already on it. I really think thats why the old 4l60 lasted as long as it did. But this is all subject to change because super chevy also stroked the 5.3 to a 383 and had it layin down over 550 hp and torque so im just toyin with all kinds of ideas right now.