I'm looking for some tech specs for the 5.3L L33. I got everything off the GM site, but I want a couple of additional things. 1.) cam timing specs. 2.) valve sizes. 3.) combustion chamber volume.

Anyone here that can vouch for how well this motor runs?

Thanks,
Andy1

 

Forgot one more question: What are the rating's on the injectors?

Andys

 

ttt

Anyone?

Andy1

 

This engine is a beast some 1 put out 300rwhp with tune, headers, intake, exhaust, plugs.

 

I think it has a like 10 more ft Tq then the regular and the HP is maybe 10 or 15 higher then the regular iron block.

 

evidentally its a cam difference?

 

Dont think the cam is any different., but not positive. Do a search of the forum, i saw the specs posted before.
The L33 is a higher compression (pistons are different) 9.9:1 Aluminum block and head motor. The factory HP rating is 310 (FWHP).

 

Thanks guys........most of the info can be had from the GM site. Here's an excerpt:

**One of the L33’s distinguishing features is its engine block. As with the 2004 LM4 Vortec 5300, the L33’s foundation is a cast-aluminum block with pressed-in iron cylinder liners, similar to the block used for GM Powertrain’s LS1 and LS6 car V-8s. The L33 block is exceptionally light; as a result, a fully dressed L33 is 100 pounds lighter than cast iron-block Vortec 5300s (RPOs LM7 and L59).

The L33 takes its cylinder heads from the LS6. Originally developed for the Z06 Corvette, these heads improve airflow in and out of the engine. With their pent-roof combustions chambers and new flat top pistons (the pistons in other Gen III Vortec 5300s have a slight sump in the piston deck), the L33’s compression ratio increases from 9.5:1 to 9.9:1. This increase improves the engine’s volumetric efficiency yet still allows it to achieve full power with regular grade gasoline.

Finally, the L33 is equipped with a higher-lift camshaft. Maximum valve lift increases from 11.6 mm on the LM7 and L59 to 12.5 mm. The new cam and compression ratio are the primary sources of the L33’s increased horsepower. **

I was looking at some specifics that I couldn't seem to find.

Andy1