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Old 08-05-2012, 01:19 PM   #1
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Default 2003 S10 L33 5.3 Swap

Been lurking around here for a while learning & researching my swap so here it is.

2003 S10 ext cab ZQ8 with 4.3 V6 which has been a good truck but poor gas mileage & not as much power as a V8 made it pretty much a no brainer as far as swaps.

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The goal was to keep it a daily driver & to have everything in the truck work just like stock,turn the key & go & have all the daily niceties like cruise control,AC,all stock gauges work,etc.
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Old 08-05-2012, 01:30 PM   #2
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I had been modifing the truck since I owned it,so it had a lot of stuff already done to it.

It is a 2003 S10 with ZQ8 suspension package which includes lowered front & rear,bigger swaybar in front & swaybar in rear,quick ratio steering box,hop shock,16 inch wheels & this is a LS model so it is loaded inside,power windows,locks,cruise,tilt,gauges,etc.

Tubular upper A arms,tall upper ball joints,drilled & slotted dics brakes,stainless brake lines,Flaming River steering joint are a few mods I have made to the suspension/brakes.

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Old 08-05-2012, 01:39 PM   #3
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So I started gathering parts...

HD two row aluminum rad with dual spal 11 inch fans.

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GM H3 Oil Pan

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JTR LS motor plates for S10

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Old 08-05-2012, 01:44 PM   #4
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Corvette LS3 water pump

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CPW Frame side Poly motor mounts

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LS1 intake fuel inj & fuel rail

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Stainless Steel S10 swap headers

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Old 08-05-2012, 01:58 PM   #5
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Picked up a wiring harness & pcm from a 2002 Silverado

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Bought a used L33 aluminum 5.3 bottom end for $500 shipped. Aluminum block,flat top pistons,floating wrist pin rods,HO cam.

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I disassembled the motor & found a couple spun rod bearings so I bought a crank that was turned 10-10 had the clys honed,new cam bearings installed by the local machine shop.

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Old 08-05-2012, 02:05 PM   #6
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Reassembled the motor with new std rings,new Clevite 77 main & rod bearings,Cloyes timing chain,Melling oil pump,ARP rod bolts,New oem main bolts,Comp cams trunnion upgrade.

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Used MLS head gaskets with a pair of LS1 heads milled .015 & new oem head bolts.

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Old 08-05-2012, 02:11 PM   #7
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I used the truck acc setup so with the Corvette water pump I had to cut the alt bracket & relocate the idler pulley with a Dirty Dingo bracket & also makes room for the LS1 intake/throttle body. And a pic of the POTZ ported throttle body.

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Old 08-05-2012, 02:22 PM   #8
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I used the LS6 valley cover to eliminate the stock LS1 style.

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Painted the valve covers black & the valley cover.

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Old 08-05-2012, 02:32 PM   #9
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So after getting all my parts together & building the motor,I removed the 4.3

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Old 08-05-2012, 02:37 PM   #10
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The 5.3 has a low mount ac compressor so I had the frame notched for clearance.

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Old 08-05-2012, 02:48 PM   #11
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Setting the 5.3 in for its first test fit.

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Pic of header clearance on passenger side. The area of the firewall buy the collector needs some serious massaging with a hammer to gain enough clearance to get your tools into tighten collector bolts. While we are on the topic of collector bolts...do yourself a favor & invest in Stage 8 hardware http://stage8.com/ for your collector & flange bolts as you dont want them coming loose after your build & they will,take my word on that. LOL

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I put some heat shield under the ac box where #8 header pipe came real close.
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Old 08-05-2012, 02:51 PM   #12
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Drivers side is real close & #3 cyl header pipe. I dented the header for clearance...more on that later.

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Old 08-06-2012, 02:37 PM   #13
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Did you have to use spacers behind the corvette water pump to get it to line up with the trucks crank shaft pulley?
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Old 08-07-2012, 10:22 AM   #14
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Yes,in my case I had to use 1.5 spacers (2-3/4 inch spacers) on each side.

It is from a VVT motor.
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Old 08-07-2012, 12:04 PM   #15
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Ok that's what I figured. Thanks!
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Old 09-18-2012, 10:11 PM   #16
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I was getting ready to build a custom steering shaft & found out if you put a couple washers between the steering box on the front two mounting bolts it kicks the steering shaft out a bit & I gained some much needed clearance on #3 cyl.
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Old 09-18-2012, 10:21 PM   #17
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Old 09-18-2012, 10:24 PM   #18
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To keep the wiring simple since the S10 fuse box is on the drivers side I mounted the pcm on the drivers side radiator support & wiring was a breeze.

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Old 09-19-2012, 02:48 PM   #19
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Quote:
Originally Posted by ZQ8LS1 View Post
I was getting ready to build a custom steering shaft & found out if you put a couple washers between the steering box on the front two mounting bolts it kicks the steering shaft out a bit & I gained some much needed clearance on #3 cyl.
That is interesting, I may try that myself, thanks for the tip.

Sweet build too.
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Old 09-19-2012, 05:43 PM   #20
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Thanx
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Old 09-19-2012, 05:43 PM
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53, ac, bolts, compressor, fbody, head, hop, kit, ls1, ls1tech, mods, oem, power, s10, shock, swap


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