The LSX with the 90mm TB will net you more power. F-bod guys love that setup. If I remember right, the 5.3 intake makes more power versus the LS1 intake. Its set up for more low end grunt. The LS1 intake does take some filign and cutting to fit on a 5.3 or 6.0 persay. I think its doable but not fun. On another note the LS1 intake will position the TB much further forward on a 5.3.
Speartech got back to me!!! :shake: They are full of info! Alas, they make the relocation bracket for about $75. That moves the idler pulley down so the TB don't hit anything.
Once you have the idler pulled moved down, then you need to do something about the agua pump. You can do one of two things...Cut the top piece down to about 3/4" to clear everything, or snag a front hosed LS1 water pump used for about $50.
Next, it'd be best to use a '97-98 C5 fuel rail as it has a return line like the trucks do. The stock truck one will suffice but will look queer due to the tall x-over line. With the C5 rail, you can then run the regular cheapass Bosch injectors (like on Mustangs) then you just need to splice in the correct injector plugs...that's EZ. that means you can get some larger injectors for super, super cheap! 42lbs/hr's for less than $250!
A forum community dedicated to GMC and Chevy full size owners and enthusiasts. Come join the discussion about Silverados, Sierras, and other full size trucks performance, modifications, suspension, lift kits, tires, maintenance, and more!