I'd say it's in the tune as well, I think it would cost the general too much money to have a to design a "colorado specific" camshaft for the 5.3L. I wonder if they're putting flat-top pistons to get the compression ratio up to 9.9:1. This makes perfect sense when mated up with a set of 64cc 243 casting heads.

 

Oh and also GM is famous for rating an engine at a given engine RPM to ge tthe desired HP result they want. 5200 RPM is awful low so if they would have wound it up another 300 RPM they probably would have gotten another 15HP out of it. It's all for insurance reasons

 

id have to fight the urge of gettin one, yankin the 5.3 and slappin a 6.2 in her...

 

My LQ9 maxes out at 5200 according to my dyno sheet.

Dealing with the weight of these trucks (the fullsizes) is just a bear.

 

 

Most glaring problem thing I see is the Quad Catalytic Converter Setup, and the lack of the Active Fuel Management System in these 5.3's. More than likely, the power is mostly a tuning issue however.

 

anyone want to bring one to Magna Charger? I will show you how to add 120 RWHP more

 

The difference is the aluminum 5.3 is lighter so its easier to replace with a 481 LSX

 

WOW! i gotta go change my pants just from the thought of that. Glad to see the 5.3 in the little truck, could be a good purchase if i want a fun "economy" car for a DD.

 

wonder how hard it's gonna be to put longtubes on one of these lol