https://www.performancetrucks.net/fo...d.php?t=462829

All depends on how well the engine has been taken care of. I would rather have a 150,000 mile engine with regular oil changes and regular maintenance by a meticulous owner than one with half as many miles that was beat on and used cheap oil and cheap filters and changed when the owner felt like it.

 

Ive not had the truck long and im not sure how it was took care of. It runs very strong. I pulled the valve cover on the newer motor and its almost clean enough to eat off of. Not had a chance to look at the older motor. The reason we're changing it is because its going through antifreeze and water like crazy with absolutely no signs of a leak. And we figure we'll just change it due to the high miles.

 

Im with the rest of these guys 400hp "flywheel" is not too tough man, but if you had an L33 like Trever1t with the upgraded CR and better heads it would take alot less.... Thats why i went with my "Iron" L33 5.3 with 4.8 flat tops and 243 heads to try to squeeze out 400hp with a baby cam and bolt ons. Hope to have this 4.8 out and the new 5.3 soon

 

well i have my 5.3 engine with the xr275hr cam, 3000 stall, shorty headers, underdrive pulley, cold air intake, helix spacer, light wieght driveshaft, original tranny, g80 with 342 gears and a custom tune from down south texas, and i am making 456rwhp and my torque was 479... i think it pertty dam good for a 5.3....... i have a couple more mods that i will be adding...

 

 

...and what size turbo?

 

nice, so was that with a 125 or 150 shot that your leaving out of this list..?

 

Not even a 6.0 with those mods would make that rwhp!

 

dynograph?


i really gotta see this

i'm barely knocking on 500 to the wheels on a loaded 6.0

 

yeah those numbers are alil high for a 5.3 without fi or nitrous.