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#26 |
I am a Referee of life.
Join Date: Jun 2000
Location: Greensboro N.C.
Posts: 13,993
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Power and milage aren't mutually exclusive.The better the power means a more efficient engine(generally).It's using that power(heavy right foot) that makes the milage drop.The 5.3 may not do any better than the 6.0 as far as milage when driven the sams.The 6 cyl in these trucks seldom gets much if any better milage than the 350 and even some BB.The EFI engines will have better driveability and should do better on the hiway than a carbed engine,but the 6.0 may have better milage heavily loaded or towing than the 5.3.There are just a lot of variables,the biggest being how you drive.
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The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil" |
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#27 |
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Join Date: Dec 2010
Location: livingston co.mi
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Re: Whats your impression of a 5.3L LS motor in these trucks?
[QUOTE=CC69Rat;5280451]Where are you finding these cheap (low priced) LS motors? Everything I find is $3k range and it has a boatload of miles on it. Maybe I'm just not looking in the right place.
x2 on that even on the 5.3 around here anyway
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California 65 GTO---Texas 64 burb 283 ---Oklahoma 67 CST SWB BBW wood bed 327 2004r---New Mexico 72 k10 350 350 auto---Georga 72 short step project |
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#28 | |
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Location: Atlanta, GA
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J/K Posted via Mobile Device
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#29 | |
Your UncleBen
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Location: Indian Trail, NC
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Quote:
lata CHRIS
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#30 |
Cruzin
Join Date: Dec 2009
Location: on the road
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Re: Whats your impression of a 5.3L LS motor in these trucks?
I'm still not convinced on the "new" motors either i just don't see it my carb. vehicles as just as driveable as my fuel injection truck to me and i just can't get past the horrible looks of the newer motors vs. the old ones. One big deal for me is all the extra stuff that is with the new ones all the wiring etc. and harder and more $$$$ to fix. just my op.
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Lime Wife's 67https://www.google.com/url?sa=t&rct=...wZEMODaS2d94u8 Back to the Fifties 59 https://www.google.com/url?sa=t&rct=...NAeStpydfrcj_U Proverbs 3:5,6 "Thanks to the Interstate Highway System, it is now possible to travel across the country from coast to coast without seeing anything."Charles Kuralt In memory of our first baby daughter, daddy and mommy love you. Danica Grace 6/26/14
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#31 |
70+ ( Old Skool Club )
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Re: Whats your impression of a 5.3L LS motor in these trucks?
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1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " Circumsatances Do Not Change Responsibility " " The Sky is not the Limit, Your Mind is." Marilyn Monroe .. RIP Charlie Watts 1941 - 2021 |
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#32 | |
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Join Date: Aug 2006
Location: Georgia
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Re: Whats your impression of a 5.3L LS motor in these trucks?
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1963 Chevrolet C10 Short Step 1968 Chevrolet C10 Short Step |
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#33 |
Registered User
Join Date: Jun 2009
Location: CENTRAL,NJ
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Re: Whats your impression of a 5.3L LS motor in these trucks?
My son has a 2011 Silverado with the 6.2 and six speed auto, it's just an awsesome truck. He gets 20 mpg if he stays at 65 mph. It would be hard to imagine the old style 350's knocking out mileage like that in such a heavy 4x4! Plus it will run the 1/4 in 14.6 !
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#34 |
Hittin E-Z Street on Mud Tires
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Location: Greenville, SC
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Re: Whats your impression of a 5.3L LS motor in these trucks?
I love the 5.3 in my 2000 Z71 ex cab 4x4. I average 14mpg with it and it will easily hit 18mpg on the highway.
I put a 700r behind a rebuilt 350 in my 67 C10. I average around 12mpg and if I keep my foot out of it, I've hit 16mpg on the highway. By the time I blew money on the rebuilt engine and 700r I could have easily had an lsx/4l60 for probably less than what I spent. I would love to put a 5.3 in my 67, but I don't want to "spend money again" on the same thing. Also, don't forget, YES these trucks do weigh A LOT LESS than the new trucks the ls engines are in, however, the 67-72 trucks have aerodynamics like a brick! Believe it or not, GM actually spent a lot of time and money making the GMT800s and 900s as aerodynamic as possible.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride ![]() American Born, Country by the Grace of God ![]() 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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#35 |
Special Order
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Location: Mt Airy, MD
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Re: Whats your impression of a 5.3L LS motor in these trucks?
I'm really torn with this type of conversion.Not against it,see the value in it yet not crazy about doing it either. What I like about these trucks is the way they were built. They are modern enough for daily driving even today,only gas costs have gotten crazy. You can fix them yourself with no special tools vs paying $75-100 an hour for a "tech". It's great to have more power than you'll ever need and still get great mileage,but I like knowing I can go anywhere I want in my 40 year old truck and no matter what happens I can fix it enough to get back home. I guess I'd like to have one of each...an old school reliable truck that is a s simple as it gets and a high-tech modern computerized old truck that I hope I never have issues with.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~ |
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#36 | |
Your UncleBen
![]() Join Date: Dec 2002
Location: Indian Trail, NC
Posts: 590
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Quote:
I was hard headed for a long time just saying I wanted a "simple" carb'd motor and all that and I totally understand that. But I am really leaning towards the newer small blocks because of that great driveability and power potential out of a basically stock engine. My basic plan was (before considering the 5.3L again) was to get a LQ4 or LQ9 6.0L, swap in a cam (for some good sounds and power), add some Camaro LS1 headers (cheap) , add a CAI and go from there. Cant argue with 400+ hp from just a cam swap and tune. I dont have to deal with flat tappets killing my cam because the oils these days dont have the zinc like they need. I mean it goes on and on the reasons for me IMO. Either way you cannot go wrong. New or old the SBC is the best engine ever made. You cannot argue with torque! Something ford guys would never know about! LOL ![]() lata CHRIS
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#37 |
Registered User
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Location: Chattanooga TN
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Well said Special-K .. Not suprised brother
![]() Maybe I'm just a little afraid of them too cause if it breaks, I just don't know as much about the new ones as I do the old ones. I don't want to get stuck in some sort of Error Code / Fault Code etc. I don't know how to fix. With the old stuff, a Phillips / Flat, and a 9/16 and you can at least get home.
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Chad 1967 C10 SWB - Project Savannah - 6.0/4L80 *Currently underway* 1968 C10 SWB - TOTY 2018, 50th Anniversary Tribute Project * Sold * Pride and Joy 1986 Silverado Short Fleet - Scarlet *Sold* 1985 Silverado Short Fleet *Sold* 2022 Jeep Gladiator Mojave 2001 Jeep Cherokee XJ 4x4 - Lifted, Built 1992 Jeep Cherokee XJ 4x4 - Lifted 2013 Honda Accord EX-L v6 Coupe 6spd (wife's ride) |
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#38 |
MEMBER OF THE JUNK MAN CLUB
Join Date: Jul 2001
Location: paragould arkansas 72450
Posts: 425
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Re: Whats your impression of a 5.3L LS motor in these trucks?
I love those lsx based engines. good mileage and great power!!
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I LIKE 67-72 CHEVYS, I HAVE OWNED OVER 150 OF THEM IN THE LAST 25 YEARS.. ![]() |
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#39 |
Registered User
Join Date: Jan 2003
Location: VA
Posts: 284
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Re: Whats your impression of a 5.3L LS motor in these trucks?
The "Fixability" (is that even a word? LOL) of the newer Fuel Injected and computer controlled engines seem to intimidate a lot of people. With a laptop, the right cable, and the right software package, diagnosing an issue with a newer drivetrain is actually a lot easier a vast majority of the time.
Not to mention the ability to tune the engine with the press of a button or a mouse click. The newer engines are literally designed to go 100K without any service what so ever, besides normal maintenance. If GM wasn’t confident in these engines, they wouldn’t offer the powertrain warranties they currently offer. Many of the “problems” encountered with the LSx engines are created by owners who do modifications. I had a 4th F-Body with a LS1 / T56 combo. That car had close to 100K when I got it. I drove it hard. It was bone stock, no mods. When I got rid of it, the mileage was closing in on 140K. The guy who bought it planned on yanking the motor when it gave up the ghost, and building it up. He’s still driving it. In fact last I heard he was planning on pulling it because the clutch was ready to be replaced. The engine itself was still going strong. He did mention he hoped to see 200K on it before yanking it. Keep in mind that this car saw the drag strip on average probably once a month. And it wasn’t babied. I’m currently on the lookout for a 4.8/5.3 combo for the kid’s ’65 C10 we’re starting on. If the price is right, I’ll pull the trigger. In my area it’s actually cheaper in the long run to buy a wrecked or otherwise damaged vehicle and pull the drivetrain and part out the rest. Reason being that people have caught on that these engines are popular for swap material. A guy I used to work with buys the newer style trucks and SUVs with the LSx drivetrain and parts them out. Around here the it’s not unheard of to get an easy $3K for a complete 5.3 with tranny and wiring harness. The other issue is that a lot of potential swappers bought engines, not realizing they needed the wiring harness, PCM and the tranny. I’ve seen guys try to piece together the drivetrain because they got a “Good Deal” on the engine, only to end up spending as much or more than they would have if they bought the entire drivetrain, ready to go. As far as cost comparison with building an older style small block Chevrolet, the divide is closing. Like someone else mentioned, if you’ve got a good running engine now, then swapping in a LSx drivetrain, unless you get a GREAT deal, is not the most sensible choice from an economic perspective. If you have a truck without an engine, or an engine that needs a total rebuild, the cost could be close to a wash. It all depends on what you want out of the engine in your truck. Buying a good running very mild 350, cleaning it up and throwing in your truck is a far cry from a properly setup LSx engine. Building a good performing, reliable old style small block Chevy is not a far reach (in cost) from a stock 5.3. And that’s doing all the wrench work yourself. That being said, most of us who work on and drive older vehicles, we know that it doesn’t make the best economic sense to begin with. If it was all about saving $$$, we’d all drive a 30mpg + compact car. Now of course many times we try to use other “arguments” to convince ourselves (or our significant others LOL) that “Swapping in a 5.3 and OD for the 350 / 3 speed will save money.” Sure it will save money on gas, but what about initial investment? The other things needed to do the swap? The wiring work, the tuning etc? I also see people “justifying” their swap by talking about how much more “driveability” the new engines have. “Just crank the key and go.” “No need to adjust the carb etc.” I don’t know what conditions some of you are driving in, but I’ve had both modern EFI engines, I’ve retrofitted EFI (mainly TPI) engines into project cars, and I’ve also daily driven carb’d engines. I drove a 408 small block with a single plan intake and a carb setup EVERYDAY, rain or shine. Averaged 20k+ the two years I drove it. Did it get wonderful gas mileage? Of course not, it wasn’t designed or built of that. But with a moderate rear gear ration and a 5 speed tranny, it didn’t do as bad as you might think. I drove that car when the temp was 10 degrees and when it was 100 degrees. I don’t ever remember having to do a lot of “tuning” for weather conditions. It’s not like I was driving in massively different altitudes every week. In fact I put right at 50K on that engine, and the only thing I remember doing to it was changing the HEI cap and rotor, because I had used a “freebie” replacement when I dropped the engine in, and it crapped out on me. In the end it will always be the owner’s choice, as it should be. If you plan on swapping a LSx engine into your truck, and you have a decent running engine now, if your primary reason for swapping is saving money, you’ll likely end up disappointed. It’s the same boat as people who traded in paid off Surburbans and Tahoes when gas prices first jumped after Katrina. They traded 12-14mpg and no car payment for AT MOST a mpg twice as good, plus the car payment. It would take YEARS for many of these people to ever realize any true savings. But I’m sure they felt better when they weren’t dropping $100 at the gas pump every week. I guess this long-winded post is simply meant say… “Do what your wallet and your ability allows. As long as YOU like it, who cares what anyone else thinks.”
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#40 |
Your UncleBen
![]() Join Date: Dec 2002
Location: Indian Trail, NC
Posts: 590
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Great post! I enjoyed reading it! haha Long winded or not!
![]() lata CHRIS
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#41 | |
Senior Member
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Location: Austin, TX
Posts: 1,079
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Quote:
i agree...... but for slightly different reasons... I work at a mechanics shop and we work on late model stuff. Most of it is really not too bad once you get to know it........ BUT.... There is just alot of fun in driving around with old school technology..... being able to fix almost everything on the truck with two screwdrivers, a set of wrenches, baling wire and duct tape if you have to. sure the mileage isn't that great.... but so what... I used to be all for putting modern technology in a classic vehicle.... but not so much any more.... there is something to be said for the old school stuff.... fun you just can't get with modern stuff...
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#42 |
Registered User
Join Date: Apr 2004
Location: Las Vegas, NV
Posts: 2,188
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Re: Whats your impression of a 5.3L LS motor in these trucks?
I'm looking hard at doing this very swap. I am pulling the 496 BBC from my truck as 6 mpg doesnt seem all that fun (not to mention way too much power than I need unless I get back into track weekends). Comparing the costs of buying a Gen II roller crate 350 to the swap and it seems to be more or less of a wash. Of course, prices will go up quickly if I get stuck and have to let someone else finish it for me... If I go with the 350 crate, I can be back on the road in 2 weekends max.
Its a lot to consider, but I am a big believer in future-proofing and gas is only going up. If I can keep costs close to the same, the 5.3 is a no brainer. There are lots of good builds on this site for tips, but it is very daunting to dive into.... Eh. So much to consider.
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#43 | |
C-10 Club Member
Join Date: Mar 2010
Location: Corona,CA
Posts: 1,001
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Quote:
![]() ![]() New motor mounts,tranny mounts drive shaft F-Body oil pan throttle cable/throttle by wire set up New headers and exhaust New fuel tank,lines and pump,return line wire harness or someone with alot of knowledge about the factory harness that can weed through the spiders nest. PCM Tuning software or a custom tune If you are a fabricator/mechanic by trade/hobby I could see this swap happening for less than 4K if you get a good price on the motor/trans and really shop the parts and do all the fab/installl. If your paying a shop you could easily end up in the 7-10K range.(thats alot of gas ![]()
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1969 Short Fleet 350/SM465 4.5/6.5 ECE drop 20" Raceline Wheels 1998 2dr Tahoe 5/7 drop 20"/22" Coys-sold Build thread...http://67-72chevytrucks.com/vboard/s...d.php?t=401910 Last edited by Cole Trickle; 03-29-2012 at 01:39 PM. |
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#44 |
Registered User
Join Date: Nov 2007
Location: Central OK
Posts: 396
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Why do this swap unless you’re going for something like the stock z06 vette LS7 motors that are 500+ hp stock? The 5.3 is an ok motor but for the money/time/trouble I don't see what the point is. Get a set of good flowing heads, that is all the LS motors have going for them except maybe they are a little lighter.
My vote is no on the LS swaps and I did research it extensively when I swapped my last truck from I6 to 350. |
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#45 |
Registered User
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Location: Central Coast California
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Re: Whats your impression of a 5.3L LS motor in these trucks?
These swaps always seem to "nickle and dime" me to death, though.
Remember this, we all talk about getting a LSx motor and tranny for a "cheap" price. But in reality, we're usually taking a gamble. How do we really know if the engine needs new gaskets or if the tranny needs a rebuild, etc?
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1972 K20 Suburban 5.7/700r4/NP205 Dana 44/H052 Sold ![]() 1972 C10 5.3L/4L60E 12bolt 5Lug - Sold ![]() 1971 K5 Blazer 6.0L LQ9 4L60E NP205 Dana 44/H052!!! ![]() 1970 K3500 1ton CrewCab 8.1L/Allison1000/NP205 Dana 60/14B!!!! - Sold ![]() ![]() ![]() 1984 K10 SWB 7.4L/4L80e/NP208 Corp 10/12 bolt Sold ![]() 1988 V30 CCLB 7.4L/TH400/NP205/Dana 60/Dana 70/3.73!!! (Sold) ![]() 2003 K2500HD 8.1/Allison1000/NP263 ![]() |
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#46 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: Whats your impression of a 5.3L LS motor in these trucks?
I think alot of people are just intimidated by the computer, yet everyone commenting here is on one!
Seriously though, you were not born knowing how to set the timing on a 350, you learned it. And before someone mentions the special equipment needed, you weren't born with a timing light, dwell meter or a vacuum gauge. Sure the newer stuff costs a little more, but that's lilife, things go up. Im sure if you all head over to the HAMB, you will find guys that say the flathead Ford is the greatest engine of all time and thatyyour SBC is too modern. Probably what people said about the SBCin these trucks when they were new, "these new trucks with their vacuum advance, automatic transmissions and power steering brakes and air conditioning, how are we supposed to work on them?!" Posted via Mobile Device
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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#47 | |
Your UncleBen
![]() Join Date: Dec 2002
Location: Indian Trail, NC
Posts: 590
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Quote:
lata CHRIS
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#48 |
Registered User
Join Date: Nov 2007
Location: Central OK
Posts: 396
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Re: Whats your impression of a 5.3L LS motor in these trucks?
To me the computer has nothing to do with it. It all comes down to a lot of work & money for nothing gained.
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#49 | |
Your UncleBen
![]() Join Date: Dec 2002
Location: Indian Trail, NC
Posts: 590
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Re: Whats your impression of a 5.3L LS motor in these trucks?
Quote:
lata CHRIS
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#50 |
Registered User
Join Date: Dec 2009
Location: Independence Mo
Posts: 4,119
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Re: Whats your impression of a 5.3L LS motor in these trucks?
The correct answer to the question though, is, there is no correct answer. It boils down to what YOU like. If we were all the same the world would be a very boring place.
If we woke up tomorrow, and suddenly it was 1972, the purists would be the guys restoring Model A's, while us LS swap guys would be the ones hot ridding them. Its really to each his own. ![]() Posted via Mobile Device
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My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html |
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