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Old July 13th, 2009, 11:38 PM   #1
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Default 5.3 vs 5.7

I'm looking at tahoes/yukons, trucks and Avalanches. I'm noticing a trent that most things are 5.3 liter V8s. What happened to the 5.7? I must have missed something, as I thought the 5.7 was the (macho voice) 350 chebby, the end all be all (end macho voice). So, whats the deal with everything having a 5.3? It that the equivlient to a 305 or what? Educate an idiot.
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Old July 14th, 2009, 12:10 AM   #2
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Its the progression of engines getting smaller and producing more HP. The 5.3L came out in the late 90's to replace the 5.7's and are about 327ish cubic inches ( but does not share many features with the small blocks.)
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Old July 14th, 2009, 12:29 AM   #3
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So the 350 isn't really produced anymore? And am I to understand that the 5.3 would pull, get better mileage, than a 350? How is the realiablity of them?
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Old July 14th, 2009, 01:04 AM   #4
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So the 350 isn't really produced anymore? And am I to understand that the 5.3 would pull, get better mileage, than a 350? How is the realiablity of them?

yes to the first set of questions and they are really strong and durable motors. make sure you use a quality motor oil as they are prone to lifter noise with lower quality oils over a long period of time.
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Old July 14th, 2009, 08:28 AM   #5
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yes to the first set of questions and they are really strong and durable motors. make sure you use a quality motor oil as they are prone to lifter noise with lower quality oils over a long period of time.

the earlier ones have some lifter tick problems occasionally but the new ones dont seem to develop it as easily. basically the old 350's are a Gen 1 and Gen 2 SBC that has mirrored ports and makes the two middle exhaust ports next to eachother, that's the easiest way to tell them apart. in the mid-late 90's they redesigned the SBC to the Gen 3 architecture which has become slang as an "LS" engine. the 4.8, 5.3, 6.0, 6.2 and 7.0 liter engines are all based on the newer Gen 3 and Gen 4 architectures. Gen 4 to Gen 3 is harder to notice but there was a pretty much seamless transition in there and the newest ones out are all now gen 4's. I would not consider anything but a gen 3 or newer, they are more modern, more efficient, more reliable and have been refined a lot since their introduction.

Let me know if you have any more questions, I'll try to help.
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Old July 14th, 2009, 09:02 AM   #6
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350's had a more "old school" torque curve peaking at 2800-3000rpm for that real low end V8 truck feel. The 5.3 is as stated, a modern small block. More power in less cubes, a broader torque curve as well as more efficiency. I still love the the old 350's, but the new motors do seem to be more well rounded.

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Old July 14th, 2009, 10:37 AM   #7
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where have you been for the last 10 years?
power per cubic inch the new LS engines are superior to the older small blocks. the 5.3 is a 325 cubic inch engine that depending on application puts out between 285 and 320 hp and 325-340 ft-lbs of torque. the early year LS engines 98-2002 are known for lifter tick and piston slap. the 03 and newer engines don't seem to have that problem.
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Old July 14th, 2009, 10:59 AM   #8
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where have you been for the last 10 years?
Apparently not reading up on GM small blocks, hence the reason he asked the question.
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Old July 14th, 2009, 05:53 PM   #9
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Apparently not reading up on GM small blocks, hence the reason he asked the question.
Bingo! I've been driving my car (3800, bonneville, GTP) while I haven't been driving a company car, semi truck yadadada. Its been awhile since I seriously looked a trucks/somthing that will pull my jeep ok, but still be functional for all my needs.

What are the opinions on a Avalanche? For some reason I got it im head that I want one. Good, bad ect? How about 03' and newer tahoes/yukons?

I only drive 15 miles to work (each way), would like to haul my jeep, scuba gear, and respond to the Fire Station. I don't have any kids, but I want the ride that I get to last me for a while (may have kids eventally).
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Old July 14th, 2009, 05:59 PM   #10
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My boss drives an Avalanche and he loves it. I love it too! Taking the lids off the back is very easy, and I've seen them pull boats and trailers without hesitation. It's easy to drive (I've driven it before) and it seems to pack a punch. Plus, the lids over the bed are REALLY handy to convert it to essentially a large trunk rather quickly for transporting things in the rain, or stop your stuff from getting stolen. When the tailgate is locked, the lids can't come off, so your stuff is safe!
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Old July 14th, 2009, 06:03 PM   #11
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i think that you need a 02 with the 8.1 468 cubic in monster.
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Old July 14th, 2009, 06:07 PM   #12
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i love the 5.3 i have in my truck. the best motor i have ever had in a vehicle. very reliable, plenty of power, and they last FOREVER. i was having a bunch of little issues with my truck and i had a spare motor sitting around so i thought i would just swap it in rather than deal with all the little piddley shit(the truck is a 99 and has 180,000 miles on it) i inspected the motor after i removed it and it was flawless. the bottom end was super tight and the bores looked perfect. i was really shocked at how good it looked. the junkyard i got the motor from said they have never sold a 5.3 as a replacement motor. they have never seen one wear out. all of them they get they sell to people putting them in toys.
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Old July 14th, 2009, 06:14 PM   #13
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i called a local junk yard for a 5.3 that a kid abused in his 1/2 ton and they said they have 20+ of em in stock and they just dont sell. i have the 5.3 in my 1/2 ton and i love it not one problem with it so far and its a 03 at 156K. i had a 93 silverado before with a 350 and toe to toe id have to say hands down the 5.3 is wayyyy better in the gas milage and towing department. mine has the z71 package and it squats pretty bad with a car hauler and rig on it but other than that im very pleased with it.
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Old July 14th, 2009, 06:28 PM   #14
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Lots of good info, thanks.. How about the Yukons/tahoes? Anyboy have expriance with those? What kind of easy (70/75 on the cruise) mileage are you guys getting with the 5.3?
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Old July 14th, 2009, 06:31 PM   #15
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in a new avalanche with a 5.3 my dad is getting about 16
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Old July 14th, 2009, 06:49 PM   #16
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I'm looking at the 02,03,04 model years..
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Old July 14th, 2009, 08:12 PM   #17
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Originally Posted by chadcooper55 View Post
i love the 5.3 i have in my truck. the best motor i have ever had in a vehicle. very reliable, plenty of power, and they last FOREVER. i was having a bunch of little issues with my truck and i had a spare motor sitting around so i thought i would just swap it in rather than deal with all the little piddley shit(the truck is a 99 and has 180,000 miles on it) i inspected the motor after i removed it and it was flawless. the bottom end was super tight and the bores looked perfect. i was really shocked at how good it looked. the junkyard i got the motor from said they have never sold a 5.3 as a replacement motor. they have never seen one wear out. all of them they get they sell to people putting them in toys.
probably because they've only been used widley since 99 lol

The 5.3L is pretty much a Modern 5.7L, like everyone says, new style motor for new style trucks

No matter what though, 5.7L owns, it's the oldest motor (50+ years) that has to count for something
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Old July 14th, 2009, 11:18 PM   #18
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The 350 was introduced in 1967 (42 years), however the small block was introduced in 1955 as the 265 (53 years).

You definately would want a 2003 or 2004, and your choice of truck, tahoe, burb, or avalanche.

If you really are concerned about milage and towing, don't rule out a diesel. A diesel will get better milage and have more torque and hold better value when it comes time to sell it. If your only complaint about diesel trucks is the fuel costs more, then you have not seen all the alternative sources you can run in your truck. A WVO burner or using bio fuel will cut cost in that department and you do not lose any performance.
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Old July 14th, 2009, 11:34 PM   #19
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Quote:
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Lots of good info, thanks.. How about the Yukons/tahoes? Anyboy have expriance with those? What kind of easy (70/75 on the cruise) mileage are you guys getting with the 5.3?
I know it's no Yukon/Tahoe but in my 06 Sierra with the Power Programmer III I can get 17-18 cruising at 75-80 MPH. The programmer doesn't do much, but anything can help. Most tanks of gas my hand calculated MPG is 17 and that is probably a 60/40 split between highway/city driving.
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Old July 14th, 2009, 11:50 PM   #20
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Just an FYI and I'm not exactly sure what years it applies to but there is a TSB for the oil pump O-ring and it's a big job to replace it. We had to change it in my Brother in Laws 03 Silverado because he had NO oil pressure. The first thing I checked when I bought my 05 was that. It doesn't apply to the 05 5.3 in Silverados.
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