maverickmk
Rebel Rodder
I agree, the bed is a little long - and the lights need to be moved in some, looks kinda' bug-eyed.
Easiest is the 01-02 5.3L from a silverado because it has a cable operated throttle body. You can uase the 03-05 ones but then you have to get the TAC module and the throttle pedal assembly as well because the T body is drive by wire. If you are fine with wiring then the second choice is better because then you can hook up cruise control with no more than adding the switches (cruise is handled all within then PCM on those years) Up here you can get a 5.3L complete with all harnesses and accesories from Bow Auto for about $700 with a warranty. If you look on craigslist you can get them for near $300.
A 4.8L is not a bad choice either becauce they are super cheap ($250 for a complete unit) and can still be in the 275 - 300 HP range with a cam and tune. Or stuff a turbo on it for a reliable 450-500hp.
later 5.3L had the same head castings as the early LS6 motors just without the light valves (#243). if you can find one an 05 L33 (or B for the 8th digit of the VIN) is an aluminum block motor and has 10.2:1 comp (as opposed to 9.8 reg 5.3) and a better cam. rated at 315 hp stock and 70 lbs lighter.
Beware of some of the 03-05 4.8/5.3 motors with the 791 heads as they has an issue with cracking around the head bolt boss and would leak coolant very slowly into the oil. Usually people would complain of coolant loss and can't find the leak. The heads had an X cast into them inside the valve cover area. Hope this helps. [P
I use a GM truck rear shackle sometimes. I trim it and weld to the frame and then just make a motor side plate. Then you just have a simple 1 bolt mount setup. Shackles are like $11
So,did you get er picked up ? If so you know that the trans is mechanically operated lever type with a NSBU switch around the shaft. The LS engine are truly a sweet setup and have HUGE power potential !
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