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#1 |
Registered User
Join Date: Oct 2010
Location: Westbrook CT
Posts: 81
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25mpg 71 C10. Need Your Help!
Currently doing a restore on a 71 c10 lwb. It will be my daily driver and will stay around for a long time and id much rather drive this than a compact cars so please shoot out ideas for 25 mpg. It currently has a 350 with a edelbrock 1406 carb, weiand single plane intake, turbo 350, 3.73 rear, hei, stock ride height and tires. I was thinking about going to a 200 4r but figured id go all the way. Any engine/tranny combo will work. Manual is preferable. Diesel or gas. No A/C. No tree pulling or 1/4 miles. Just a cruiser for around town. Please help me out guys. Thanks!
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#2 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: 25mpg 71 C10. Need Your Help!
maybe a small diesel from a forklift or small car. i know for the price of the swap id buy a pos dd that gets good mielage and keep the truck fun.
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#3 |
Registered User
Join Date: Jun 2010
Location: Jefferson, MD
Posts: 2,397
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Re: 25mpg 71 C10. Need Your Help!
merc diesel hooked up to anything. Check member cell's truck for info on the swap.
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'68 Dodge Dart 270, 225, 904, 2.76--"Lucy" 1996 Gmc 1500 Z71, 350, 4l60e, 3.73s 1995 Jeep Wrangler Rio Grande 2.5, AX5, 4.10s 1989 Toyota Pickup 22re, auto, 3.73 |
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#4 |
Registered User
Join Date: Apr 2010
Location: Russiaville
Posts: 203
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Re: 25mpg 71 C10. Need Your Help!
Easy!! Have someone custom make a carbon fiber body, ( trucks are heavy ) have an aerodynamyicist reconfigure the body design ( these trucks are as aerodynamic as a brick ). Put a wee little 4 banger diesel in there, accelerate reeeal slow, and enjoy your new creation.
OK a little over the top there, sorry. Your asking for 25mpg for cruising in town? The amount of money that you sink into trying to achieve this miracle will buy you a ton of gas. You will never see any savings. |
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#5 |
Registered User
Join Date: Jun 2010
Location: Jefferson, MD
Posts: 2,397
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Re: 25mpg 71 C10. Need Your Help!
See, I don't think it would be all that expensive to do. Might be even able to do it with a 6.2 Detroit diesel, T-5/TKO, and 3.07 rear.
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'68 Dodge Dart 270, 225, 904, 2.76--"Lucy" 1996 Gmc 1500 Z71, 350, 4l60e, 3.73s 1995 Jeep Wrangler Rio Grande 2.5, AX5, 4.10s 1989 Toyota Pickup 22re, auto, 3.73 |
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#6 |
Enjoying left field
Join Date: Jun 2008
Location: Dillon Montana
Posts: 900
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Re: 25mpg 71 C10. Need Your Help!
Yeah I'll second the 6.2. My nephew had an 84 4wd with a 6.2and a turbo 350 and he got that kind mileage. With a 2WD drive truck and an overdrive tranny you could probably do better. And you can pick them up for cheap and they'll bolt in with minimal work
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#7 | |
Charlie Daniels w/ a Tq Wrench
Join Date: May 2009
Location: Statesville, NC
Posts: 1,570
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Re: 25mpg 71 C10. Need Your Help!
Quote:
I had always dreamed of a Cummins 3.9 4BT swap mated to a 700r4 or possibly a T5 as well, I have seen conversions "claiming" of 30mpg from those. 72redneck the 4BT itself does not have a Chevy bellhousing pattern, but the ones that came in breadtrucks commonly had adapter plates to mate them to the TH400.
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ΜΟΛΩΝ ΛΑΒΕ 67 C10 Shortbed "Great Grandpa's Truck" I6 3 on the Tree 71k original miles 5.3 swap in the works69 K5 Blazer-Family Beach Cruiser Project 78 K30 Dually Semi-Retired Fire Truck 350/SM465 35"s SOLD01 2500HD ECSB 6.0 4x4 5.13's 8" lift 38"s Last edited by GCncsuHD; 06-11-2011 at 02:28 PM. |
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#8 |
Just a car guy
Join Date: Feb 2006
Location: New Washington, IN
Posts: 991
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Re: 25mpg 71 C10. Need Your Help!
25mpg on highway may be possible, maybe.
Overdrive tranny, go to a numericly lower rear gear like 2.73-3.08, lose the single plane and the edelbrock, go to a performer and tbi or a tpi set up. Good exhaust, lighten truck as much as possible, lower it, tires as skinny as possible, 225-235, tune tune tune, etc... Posted via Mobile Device
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1955 belair Blown Pro Street cruiser 1971 Camaro Pro Touring 1973 Vega Drag Car 1970 C20 tow rig |
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#9 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: 25mpg 71 C10. Need Your Help!
Some 4BT cumminses have Chevy bellhousing patterns. Dad did a 4BT swap and got around 22 MPG at 80 mph.
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1966 F250 4X4 416 1972 K20 350 4 OTF Last edited by 1972RedNeck; 06-11-2011 at 02:25 PM. |
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#10 |
Redefining LowBudget
Join Date: Mar 2009
Location: lebanon Cow Hampshire
Posts: 4,538
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Re: 25mpg 71 C10. Need Your Help!
I was thinknig of the Isuzu deisal with the automatic behind it out of a box truck.......
cheap to buy with good parts available...also the size makes it an easy fit under the hood and tunnel
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1970 C10 CST fleetside 472 ....big dreams little cash... SunShine Syndicate.. ![]() Mikes Sandwich Fair Run OCT 8th 2011
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#11 |
Charlie Daniels w/ a Tq Wrench
Join Date: May 2009
Location: Statesville, NC
Posts: 1,570
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Re: 25mpg 71 C10. Need Your Help!
Yea Isuzu makes a 3.9L 4cyl diesel very similar to the Cummins 4BT that is pretty popular for conversions. 4BD1T I think?
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ΜΟΛΩΝ ΛΑΒΕ 67 C10 Shortbed "Great Grandpa's Truck" I6 3 on the Tree 71k original miles 5.3 swap in the works69 K5 Blazer-Family Beach Cruiser Project 78 K30 Dually Semi-Retired Fire Truck 350/SM465 35"s SOLD01 2500HD ECSB 6.0 4x4 5.13's 8" lift 38"s |
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#12 |
Registered User
Join Date: Oct 2010
Location: Westbrook CT
Posts: 81
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Re: 25mpg 71 C10. Need Your Help!
Didn't think i would get this kinda of response in a couple of hours. I was looking at the cummins 4bt but i heard they are incredibly expensive. Ill look at the 6.2. Is it a good engine? Is it decently priced? Keep the ideas flowing guys, im loving it.
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#13 |
Charlie Daniels w/ a Tq Wrench
Join Date: May 2009
Location: Statesville, NC
Posts: 1,570
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Re: 25mpg 71 C10. Need Your Help!
It is a good engine and yields great mileage, but it is gutless and does not hold up well to hotrodding, but driven normally it is pretty reliable.
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ΜΟΛΩΝ ΛΑΒΕ 67 C10 Shortbed "Great Grandpa's Truck" I6 3 on the Tree 71k original miles 5.3 swap in the works69 K5 Blazer-Family Beach Cruiser Project 78 K30 Dually Semi-Retired Fire Truck 350/SM465 35"s SOLD01 2500HD ECSB 6.0 4x4 5.13's 8" lift 38"s |
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#14 |
Registered User
Join Date: Apr 2010
Location: Russiaville
Posts: 203
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Re: 25mpg 71 C10. Need Your Help!
My B-I-L tried the 700r4 behind a 283 with 308 gears, only got 16mpg on highway. Changed to a 350, got 16mpg. The problem is that with such a low gear and overdrive, the engines couldn't get to the proper power band, they would lug at 60mph.
The package has to fit togather for the mileage increase. You also have to look at the cost\benefit. Putting $3000+ into an effort to get a little bit of extra mileage just doesn't add up. And trying to get 25mpg cruising in town will never happen. In fact driving in town with a low gear ratio will actually have a reverse effect. The less mechanical torque available to start moving from a stop will increase gas useage. Now if you have the money, and just want to experiment, then go for it. No better teacher than trying it for yourself. |
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#15 |
Senior Member
Join Date: Jan 2005
Location: Ontario, Kali
Posts: 2,427
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Re: 25mpg 71 C10. Need Your Help!
4cyl diesel in your c-10 with a manual tranny.
You can always go electric.
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![]() ![]() It ain't yours, if you didn't build it! Last edited by Dano69c10; 06-13-2011 at 12:35 PM. |
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#16 |
Registered User
Join Date: Oct 2010
Location: Westbrook CT
Posts: 81
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Re: 25mpg 71 C10. Need Your Help!
I dont mean to sound rude but i did some research on the 6.2l. It looks like it is a decent engine and can be picked up cheaply. Thanks for the tip guys. Im going to discuss it over with the parents see if i get the green light.
I think the setup im going to shoot for is a 6.2l with a t5 and ill keep the 3.73's in the back. Would this work well? Would i have to beef up the t5? ideas please. |
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#17 |
Registered User
![]() Join Date: Feb 2011
Location: prescott, az
Posts: 225
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Re: 25mpg 71 C10. Need Your Help!
Fast ez-efi
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1971 C20 Longhorn Custom Camper |
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#18 |
Cruzin
Join Date: Dec 2009
Location: on the road
Posts: 2,835
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Re: 25mpg 71 C10. Need Your Help!
i can't believe nobody has said an Ls motor good power and mileage. Lots of people on here have swaped in newer V-8s like the 5.3 and 6.0.
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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
Last edited by Hubscrub; 06-11-2011 at 08:07 PM. |
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#19 |
Registered User
Join Date: Oct 2008
Location: Marianna Arkansas
Posts: 7,270
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Re: 25mpg 71 C10. Need Your Help!
If we were talking LS I would say look into the 4.8 They are a lot cheaper than the 5.3's more economical as well . In a truck [I am talking the truck they came in] 99-say 2006 with all being equal the 5.3 might get 18-20 and the same truck with a 4.8 might get 22-24. Now the 6.2 l diesel is a great powerplant I had one in a 89 c1500 that I would pull my car hauling trailer with it had about 250,000 when I quit using it much and sat for a couple of years then I could not get it to start again[pump problems] Now that truck would get about 20 mpg empty. I have a cousin that had a 83 swb silverado that had a 6.2 and he got 28 mpg on the hiway. Never could find out how. Now you can find the 6.2's on the c-list a lot of guys buy them surplus from hummers and you can get them with super low miles under 20,000 for a song. Your undertaking is not an easy one. You will spend a lot of money and still may be way short of your goal. Like I tell my dad when we are having a tough time about building the late model wrecks we rebuild" if it were easy everyone would do it" .Jim
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#20 |
Registered User
![]() Join Date: May 2007
Location: dallas ga
Posts: 1,505
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Re: 25mpg 71 C10. Need Your Help!
best I have got on avg with my ls is 20 if i keep the foot out of it
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#21 | |
Fabricate till you "puke"
Join Date: Jun 2002
Location: Ill
Posts: 9,403
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Re: 25mpg 71 C10. Need Your Help!
Quote:
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69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears.... |
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#22 |
Registered User
![]() Join Date: Aug 2010
Location: NH
Posts: 368
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Re: 25mpg 71 C10. Need Your Help!
I'd also have to say a 6.2 diesel....
The military CUCV 4x4 Blazers with a 6.2, TH400 and 3.08 gears get lower 20's for mileage. Like someone said before, with an automatic w/ overdrive or a 5 speed, you could pretty easily get 25 mpg I would think. This might be wrong, but I thought I read somewhere that 6.2's can use 350 motor mounts (or at least with the CUCVs).
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- 2010 Silverado - 1984 Chevy M1028 (K-30) - 1969 Chevy C-30 - 1933 Ford Stock Car |
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#23 |
Registered User
Join Date: Oct 2010
Location: Westbrook CT
Posts: 81
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Re: 25mpg 71 C10. Need Your Help!
So a 6.2 without turbo. 700r4 and a 3.73 with stock tires would be a awesome setup?
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#24 |
Enjoying left field
Join Date: Jun 2008
Location: Dillon Montana
Posts: 900
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Re: 25mpg 71 C10. Need Your Help!
Sorry. Feeling a little snarky tonight.
Last edited by woodwright; 06-12-2011 at 02:00 AM. |
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#25 |
Registered User
Join Date: Oct 2007
Location: Fort Smith,AR
Posts: 1,305
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Re: 25mpg 71 C10. Need Your Help!
This is a good thread. A buddy and I are wanting a reliable engine in our '67's. The only difference is I lay body. Any ideas if the pans on the 6.2 hang below the front crossmember on these trucks? I know the LS are ok on a bagged truck.
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