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01-19-2018, 07:47 PM | #1 |
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Join Date: Jul 2014
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5.3 into a square -- questions
Truck is a 1987 v20 pickup, used for general farm errands and personal transportation, and likely a 12k cattle trailer in the future.
Truck tbi engine is rather tired, has never ran well, and is having numerous wiring issues. Faced with learning the entire tbi system, rewiring it, and likely replacing the engine, I think I'd better start with a better engine. Donor is a 2010 tahoe that was rolled a couple weeks ago, and is available in its entirety for scrap price. Engine will be attached to existing sm465 manual transmission, using a 6.0 flywheel and stock clutch. Already have a new stock radiator in the truck, so will use that. Can I install the 2010 fuel pump into the 87 tank? Is there a practical option for a engine driven fan, or should I plan on electric fans? Can the old-school clamped fuel hoses handle the fuel pressures required? Will I in any way regret using a stock 5.3 over a fully rebuilt 350 tbi? |
01-19-2018, 09:47 PM | #2 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 5.3 into a square -- questions
The fuel hoses MUST be changed out. You'll need all high pressure EFI hose, or braided line, and the appropriate clamps. The difference in pressure between a carb/tbi setup and LS rail pressure is a full order of magnitude.
No you won't regret it.
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01-19-2018, 09:52 PM | #3 |
Post Whore
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Location: Alabama
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Re: 5.3 into a square -- questions
I contemplated keeping my sm465 but opted for a nv4500..no regrets for the o.d.
you could use the fuel pump as you asked but you can also use a inline walbro 255 and a vett filter/reg...much easier setup... just use elec fans... no, on old school hose clamps. .you'll be running 60+ psi on fuel pressure. ..don't take the risk.. will you regret it? I doubt it..
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01-31-2018, 05:17 AM | #4 |
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Re: 5.3 into a square -- questions
Why not swap the transmission too? I know a lot of people prefer manual transmissions, but it shouldn't take much to convert the transfer case in the truck to mate up.
The 6L80 uses the same shaft spline as a Turbo400/4L80E, which were mated to the transfer case in that truck. Around 1980 the 10 spline shaft in the SM465 was converted over to a 32 spline (same as Turbo400/4L80E), and later ones also got the round pattern would should be the same as the one on the 6L80. Just thought I would mention that option. If that tahoe has a 6L90, you would have to have a transfer case with a 29 spline input, the Dodge NP205 had this. I think the 5.3 will make the same if not more torque and a lot more horsepower. Especially if your tbi is really worn and the 5.3 is still in decent shape.
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E |
01-31-2018, 10:18 PM | #5 |
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Re: 5.3 into a square -- questions
I prefer a manual, so that takes preference. Also, not running tranny cooler lines, much simpler wiring, and not changing out the steering column is a big plus.
Exhaust question -- It appears I have two options. #1, keep the sm465 and external slave as is, and buy a different drivers side manifold. It will likely take a bit of work to massage the cat in around the slave. I'll be paying an exhaust shop to do that, so that's more dollars. #2, spend $350 for an internal slave, and use the existing manifold and much of the existing collector pipe/cat assembly. This brings with it the hassle of replacing the internal slave if it fails, but makes for a much cleaner exhaust installation. Which route would you go? |
01-31-2018, 11:01 PM | #6 | |
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Re: 5.3 into a square -- questions
Quote:
For option 1, I would also run matched manifolds. There's the common Hooker LS cast manifolds and the CTS-V.
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1972 GMC Jimmy Custom 4.8L (L20)/6L90E/NP205 1989 Chevy Suburban V2500 350/Turbo 400/4.11 gears 1996 Chevy Suburban K1500 350/4L60E |
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02-01-2018, 01:54 AM | #7 |
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Re: 5.3 into a square -- questions
The 2010 Camaro exhaust manifolds fit without the need to notch the frame.
I am pretty sure that if you used the camaro manifolds and the truck cats, but moved the cats back a bit the only thing that you would need to change would be the length of the o2 sensor wires, the placement of the cats further back on the exhaust to clear your slave shouldnt screw with the o2 readings. You could use your existing fuel sending unit in the tank just change out the in tank pump, you have an 87 so it already has the anti-slosh basket in the bottom of the tank. if it is a single tank truck you would just need to install some earls fittings and high pressure fuel line, quick n dirty. if it is a dual tank set up, same difference, again you should already have the high pressure tank switch. the inline corvette filter and regulator is a simple setup with single or dual tank. Here is some more info - THIS SET UP you COULD run an engine driven cooling fan, just install a 99-2005(ish) water pump which has the provisions for the threaded fan adapter and get a fan and fan clutch from a 99-05(ish) truck. This is a direct bolt on swap. I think your going to have issues with emissions unless you plan to fully integrate the vapor recovery system and such. if your not worried about emissions you could ditch the cats and not worry about the slave being in the way. the cats are not necessary for proper function of the engine if removing emissions. But i have no idea how emissions testing is done outside the Kalifornia Communist Republic. -Izzy
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02-01-2018, 01:47 PM | #8 | |
meowMEOWmeowMEOW
Join Date: Sep 2009
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Re: 5.3 into a square -- questions
Quote:
Our emissions tests are performed by $9 lube shop employees.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
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02-01-2018, 07:21 PM | #9 | |
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Re: 5.3 into a square -- questions
Quote:
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02-20-2018, 04:25 PM | #10 |
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Re: 5.3 into a square -- questions
More questions.
How important are matched exhaust manifolds? I have a complete set of trailblazer manifolds, and am planning to buy a driver's side '98 to '02 camaro manifold(to clear the slave cylinder). Will the mismatched manifolds hurt anything? The camaro manifold will have an o2 bung in the manifold itself. The TB manifold does not. Will the different sensor positions matter? Is it reasonable to mount the obd2 port under the hood? It would potentially keep the wiring harness a lot neater. This a fourth gen engine. Is there a cheap way to convert to drive-by-cable? Again, it would simplify the wiring harness considerably. Keep in mind, this is a pretty basic truck. No AC, no cruise, no automatic, etc. If it's not essential to operation, I'm eliminating it. Since I'm not running circuits into the cabin for the above functions, it would be nice to continue the theme, and keep the engine harness out of the cabin altogether. Last edited by kipps; 02-20-2018 at 04:35 PM. |
02-20-2018, 11:41 PM | #11 |
meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: 5.3 into a square -- questions
Mismatched headers will flow different amounts, so you'll have some imbalance between the the STFT/LTFT readings and your 02 readings. On a stock motor you can get away with it, but its not ideal. If the difference between the banks is high enough the computer may toss a code as it thinks something is wrong and attempts to correct.
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'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD
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