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#1 |
Registered User
Join Date: Oct 2007
Location: Fort Smith,AR
Posts: 1,305
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question about a 5.3 install
What can this cost and what is everyone getting as far a gas mileage? I want to do this swap and have for a long time. How long does this swap take? Very hard or somewhat easy?
Last edited by The Big Green; 05-29-2008 at 11:59 PM. |
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#2 |
Senior Member
![]() Join Date: Jun 2002
Location: Kansas
Posts: 702
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Re: question about a 5.3 install
I put a 5.3 in my 51, after picking up your motor / trans, figure on at least another $1185 (Speartech) for custom harness & reworked computer (you supply the CP) & then the usual $450 or so for exhaust. I suggset you fab your own motor mounts so you can put the motor where you want. another $200 to $300 for fuel pump. If you have basic fab skills then its not a difficult instl. just fun. I'll never go back to the carbed small block for a driver. I haven't checked milage yet, but I will tomorrow on the way to Colorado Goodguys show. I am hoping for better than 20 MPG. I'll post my results when I get home.
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The kid Build threads: 51 Jimmy http://67-72chevytrucks.com/vboard/s...d.php?t=154951 http://67-72chevytrucks.com/vboard/s...d.php?t=219902 http://www.classictrucks.com/feature...uck/index.html 68 C10 http://67-72chevytrucks.com/vboard/s...ad.php?t=50348 |
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#3 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: question about a 5.3 install
There is a ton of information about that in this forum.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#4 |
*---------------*
![]() Join Date: Mar 2008
Location: Central Missouri
Posts: 1,791
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Re: question about a 5.3 install
here is one of the nicest 5.3 swaps I've seen in an older truck. this thing looks like my '01 under the hood.
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2001 GMC SIERRA 1956 Chevy Panel Build Page with a Scott's Hotrods IFS 1953 Chevy trucks Project Dime Time 1968 Camaro 1968 Volksrod "NOBACK" Jared |
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#5 |
Registered User
Join Date: Feb 2007
Location: Cali Central Coast
Posts: 5,191
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Re: question about a 5.3 install
wow, that guy did a very clean job on that conversion.
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'67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD ![]() Click here to support the board Philippians 4: 6-7 |
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#6 |
I'm a poor spectator
Join Date: Aug 2006
Location: San Antonio, Tx
Posts: 2,287
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Re: question about a 5.3 install
Absolutely, that looks great.
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2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig ![]() 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! ![]() 1979 Ford F150 4x4 SWB Built Ford Tough!!! ![]() 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!! |
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#7 |
Registered User
Join Date: Oct 2007
Location: Fort Smith,AR
Posts: 1,305
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Re: question about a 5.3 install
That truck is very nice and clean, thats what I want. My truck may never be that nice but atleast the engine will run good and keep the pg up a little higher than 12-14. I'm hoping with my new stock 350 it may get 16, the other number was with 11.1's, 305 comp, and 750 holley.
Kid I'm sure the mpg will be a bit different on a 51 but it can get me a idea, shouldn't be much different if it is. I'm starting on a 49 and would love this swap on it also. With gas prices the swap will pay for itsself before long and we can keep this trucks on the road more, i'd love seeing more out around. |
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#8 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: question about a 5.3 install
My post apparently got cut off early. This is approximately what I'd originally typed:
There is a ton of information about that in this forum. A lot of members around here have done similar swaps, and MPG is going to vary based on whether you go carb'd or EFI, how your setup is tuned, whether you use a 4.8/5.3/5.7/6.0, whether you go for performance upgrades, what gear ratio and tire size you use, etc. etc. http://67-72chevytrucks.com/vboard/s...86&postcount=5 That's a link to a recent post with links to other threads that members have created here showing their swaps, how they pulled it off, and i bet MPG is discussed there as well. General avg MPG from what I hear is 16-19 city and 20-26 highway on a mostly-stock engine. Even on carb'd setups, I have seen guys @ LS1tech say they're getting 14-16mpg in the city and 17-19 hwy.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#9 | |
Hittin E-Z Street on Mud Tires
![]() Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: question about a 5.3 install
Quote:
Even so, these trucks may be lighter, but are still bricks. With a 3.73 rear end and a good tune I could see 15 city being reasonable as well as 20 highway, but 20 city, or even 20 for a mix of city/highway... well... my 2.2L 5 speed S-10 can barely pull off 21/22 city.... so... ![]() My 67 with a 350/700r4/3.73 gets an honest 12.5-13mpg city and 16 maybe 17 highway depending on speed (60 can get about 17 while 80 drops it to 15 mpg.)
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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! Last edited by 67ChevyRedneck; 05-30-2008 at 10:19 PM. |
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#10 |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: question about a 5.3 install
I talked to Mark Campbell from Street and Performance, not long ago, and he said that he and his people had put a LS-3 in a 96 Chevy truck and the owner was getting a good 22+ MPG (highway) from it. Granted the truck is slightly lighter than a mid seventies, but it was an extended cab and the LS-3 is a Gen III motor like the 5.3 motors. I have a LS-1 sitting in the frame of my 68, but have not gone far with it. As for motor mounts, there are many on the market, SOME will NOT clear the stock manifolds, but there are options on the market. I am going to use the tubular mounts from CPP.
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#11 |
Questionable
Join Date: Mar 2005
Location: Atlanta
Posts: 13,376
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Re: question about a 5.3 install
the majority of people running GenIII + T56 + 3.73 gears are claiming 22-24 as a pretty common number with solid tuning an dno serious performance upgrades.
it's important to remember one thing here: most of us are installing these engines with free-flowing exhaust, no emissions equipment, and a better tune than the original car came from the factory with. so, i don't think it should be a surprise to see 5-6mpg more in this case. just something to think about ![]()
__________________
If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (link) I can't check the forum daily. If I don't reply to you within 24 hours, drop me a PM! I'm (hopefully) still alive and will reply faster to a PM. |
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#12 |
Senior Member
Join Date: Aug 2005
Location: tulsa OK
Posts: 3,070
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Re: question about a 5.3 install
another clean install
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#13 |
Always wrenching!!
Join Date: Apr 2007
Location: Sacramento, CA
Posts: 301
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Re: question about a 5.3 install
I found my 5.3l and 4L60E complete with harness, pcm, and drive line from a 04 Tahoe with 20k on them for $800. I found a set of Vette LS1 fans for free. I modded my own wiring harness. My old boss tunes LS based cars and trucks, do free tunes on the pcm. I used the stock exhaust manifolds. Spent $20 on craigslist for the flanges to bolt to the manifolds. cut and re-welded my factory exhaust system. made my own motor plates and used my factory mounts. Used the stock trans cross member and just re drilled holes in the frame. re-used the 71 radiator and factory tranny lines. used my stock gas tank. had the Tahoe one piece drive line cut down. I'm sure there is more. if you can be patience you can find deals on everything...... good luck
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71 C-10 5.3L/4L60E 72 Camaro LS6/4L60E 06 Duramax 19 RZR XP4 turbo Dynamix 56 Belair 5.3/4L60E swap in progress |
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#14 | |
Registered User
Join Date: Apr 2001
Location: DALLAS,TX
Posts: 21,980
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Re: question about a 5.3 install
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
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#15 | |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: question about a 5.3 install
Quote:
The sheet metal and frame construction of an 88+ truck is flimsy as hell compared to the earlier trucks. There is a good chance that there would be a reasonable match on the weight. |
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#16 |
Registered User
![]() Join Date: Apr 2008
Location: auburn,al.
Posts: 32
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Re: question about a 5.3 install
i thought a 67-72 weighted about 1000 lbs. lighter. my 98 z-71is almost 7000 lbs.
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#17 |
Registered User
Join Date: Oct 2002
Location: Iowa
Posts: 71
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Re: question about a 5.3 install
I hope the old trucks are lighter! The GVW plate on my 70 C-10 LWB lists the GVW as 5000 lbs... in order for it to have anywhere near a "half-ton" payload, that means its dry weight has to be near 4000 lbs... Whereas my 92 F150 x-cab longbox 4x2 weighs 5200 lbs empty. Sorry for the ford reference...
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#18 |
Registered User
Join Date: Aug 2006
Location: Georgia
Posts: 850
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Re: question about a 5.3 install
Those 5.3's are really nice. I wouldn't mind having one myself. I worked at a dealership and if I ever had to go out in one of the GM trucks or SUVs with the 5.3 I couldn't help but punch the gas at least once. Great motor.
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#19 | |
Parts and more parts
Join Date: Nov 2003
Location: Lebo, Kansas (middle of nowhere
Posts: 6,821
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Re: question about a 5.3 install
Quote:
My 91 1/2 ton, standard cab, SWB fits into the world at under 4000 lbs. If you take the frame construction (lightweight, thin, and full of dynamicically placed holes) and compare it to the frames on the older trucks, there is a significant difference. The sheetmetal is thinner and easier to dent, than the older trucks. Heck, even the metal bed floors are thinner in the later ones. The extended cab design is going to have more metal overall, but pound for pound--equal design standard cab to standard cab, I say the 88+ is lighter. |
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