Mar 22, 2018 - INTERNAL ENGINE MODIFICATIONS - 862 vs. 706 heads - L33 engine in son's turbo truck has a cracked block. L33 is a higher output 5.3L with aluminum block. Some of the propaganda from Chevy states that the heads on the L33 are LS6 units with bigger valves and bigger ports. Every thing I've read says the 862 (on the L33)...
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They list the torque for both engines as equal @ 335 @ 4000. If this is true what I read in this brochure the only things I can think of for the HP differences are different (better flowing) heads and a cam upgrade. What do you folks think? The cylinder head casting # is 799 for my 2006 L33.
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To further the gains offered by the cam upgrade, we decided to replace the factory 317 heads on the 6.0L test motor with 706 heads from a 5.3L. Before you get all up in arms about how the 317 heads flow like 243 heads and the small-valve 706 heads would be a step-down, let's take a look at the facts.
The LS2 cam is for the LM7 which will end up in the newly aquired 63 Nova wagon and the LS3 cam will be for the L33 that will be for my 72 GMC. What do I need to install these in the engines. I have a 3 bolt timing gear for the LS3 cam.
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To further the gains offered by the cam upgrade, we decided to replace the factory 317 heads on the 6.0L test motor with 706 heads from a 5.3L. Before you get all up in arms about how the 317 heads flow like 243 heads and the small-valve 706 heads would be a step-down, let’s take a look at the facts.
Jun 02, 2008 · Aluminum 5.3L LSx (L33) w/ Muncie 4-speed (M21). Hurst Comp Plus shifter, LS1 intake, early LS1 cam, LS6 valve springs, custom 1-3/4" stepped longtubes, 3" single exhaust, I-J crank scraper, baffled oil pan, AL driveshaft.