new engine ideas - The 1947 - Present Chevrolet & GMC Truck Message Board Network

hunter43 · 02-01-2009, 12:07 AM

I am swapping out a chevy 6 in my 72 c10 for a more fuel efficient engine. Anyone got a suggestion on something that will push the truck around but still get better gas mileage? Hunter43

big_al_71 · 02-01-2009, 12:08 AM

Vortec 4.3 with a 700r4 tranny...

pumpgas · 02-01-2009, 12:10 AM

Any LSX engine and an over drive trans.

Chevymann1968 · 02-01-2009, 12:21 AM

BLown 4.3 with overdive!!! LOL That would be pretty cool!!!

LuckyHenriksen · 02-01-2009, 12:54 AM

5.3 LSX with a 6 speed automatic would be sweet, even sweeter if you added a gear vendors to make it a 12 speed and put paddle shifters on it

**clay68c10** · 02-01-2009, 01:03 AM

Any gen 3 (LSx) and it's matching overdrive trans. Those motors just make nice power and don't eat a lot of fuel.

67ChevyRedneck · 02-01-2009, 01:20 AM

How much money you got?

Cheapest route (assuming it runs well) is to back the I-6 with a 700R or 5 speed (seems to be more popular with the straight six crowd.)

The 4.3 with a 5spd or 700R is another good option.

Personally, if I had the extra $$$, I'd install a 5.3/4L60. 290 HP stock, fuel injection, OD transmission, it's just a little pricey for the set up and all the stuff to make everything work together.

HOWEVER, if you do a lot of "city driving," under 45mph or so, you won't see much of a difference with any of these set-ups.

Longhorn Man · 02-01-2009, 11:23 AM

how many MPG you getting now?
How much you looking to spend?
How much MPG do you expect out of this truck?

LuckyHenriksen · 02-01-2009, 12:09 PM

MAST motorsports put their L92 crate motor and the 6L80 trans in a '68 short bed, they got 17 MPG on the power tour, and that motor puts out 525 horses

Elephanthead · 02-01-2009, 04:30 PM

I would like to drop in a 4 cylinder direct injection ecotec. VVT and fuel sipping economy, with my granny tranny, my c30 will still pull like a bull.

67ChevyRedneck · 02-01-2009, 05:56 PM

Quote:

Originally Posted by LuckyHenriksen

MAST motorsports put their L92 crate motor and the 6L80 trans in a '68 short bed, they got 17 MPG on the power tour, and that motor puts out 525 horses

That's cruising down the highway. It probably only gets 11-12 mpg in "city" driving. The 6.2L 6L60 Denalis are rated at 12mpg with a 3.42 rear gear. It most likely also requires premium fuel.

ChevLoRay · 02-01-2009, 11:24 PM

In theory, a larger engine in a smaller body will use less fuel to move it....in theory. The truth is that we tend to like the idea of a bigger engine and then we flog the crap out of it, just for tickles and grins....

My '96 GMC has a 4.3/AOD and I get about 17MPG around town, on average. Is that the kind of improvement you want....if it is an improvement?

An acquaintance of mine used to race dirt track with motors that were built to be claimed (I think that is the right term). Anyway, he would start with a 4.3, add a pair of heads from a 229 V-6, do a little "finaglin'" and a little bit of exhaust work to pair up the right cylinders in order to achieve a good scavenging effect, then clean up on the track. So, the 4.3 can be made to run, and with a good transmission/final drive ratio, also made to be somewhat economical.

Would I put one in my truck? What, and give up my V-8? Never happen, GI!!

LuckyHenriksen · 02-01-2009, 11:35 PM

Haha the way I drive I would be lucky to get 9 MPG out of a 525 horse motor

02-01-2009, 12:07 AM	#1
hunter43 Registered User Join Date: Jul 2007 Location: edmonds, wa Posts: 3	new engine ideas I am swapping out a chevy 6 in my 72 c10 for a more fuel efficient engine. Anyone got a suggestion on something that will push the truck around but still get better gas mileage? Hunter43

02-01-2009, 12:08 AM	#2
big_al_71 Registered User Join Date: Jun 2008 Location: South Florida Posts: 11,375	Re: new engine ideas Vortec 4.3 with a 700r4 tranny... __________________ Get your facts first, and then you can distort them as much as you please!!!!!. Sylvester's build thread >>>http://67-72chevytrucks.com/vboard/s...ht=big+rebuild

02-01-2009, 12:10 AM	#3
pumpgas Registered User Join Date: Dec 2008 Location: indiana Posts: 304	Re: new engine ideas Any LSX engine and an over drive trans. __________________ 00' Z28 ("wifes" car) 92' Mustang w/sbc everything needs a little heart beat 87' GMC Sierra Classic Short Bed Fleet side almost stock 69' Chevy short step carbed 6.0 w/400th trans. Completed w/325 miles on it

02-01-2009, 12:21 AM	#4
Chevymann1968 Registered User Join Date: Sep 2008 Location: Houma LA Posts: 193	Re: new engine ideas BLown 4.3 with overdive!!! LOL That would be pretty cool!!! __________________ 1968 GMC Rebuilding Stage 2001 Camaro SS SOLD

02-01-2009, 12:54 AM	#5
LuckyHenriksen Registered User Join Date: Oct 2007 Location: Sherwood Oregon Posts: 1,908	Re: new engine ideas 5.3 LSX with a 6 speed automatic would be sweet, even sweeter if you added a gear vendors to make it a 12 speed and put paddle shifters on it __________________ 1968 Yenko Chevy LWB 6.0L/TH400 3/4 Drop Senior Project Build Thread Here

02-01-2009, 01:03 AM	#6
clay68c10 Senior Member Join Date: Aug 2004 Location: Centennial, CO Posts: 2,988	Re: new engine ideas Any gen 3 (LSx) and it's matching overdrive trans. Those motors just make nice power and don't eat a lot of fuel. __________________ ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ

02-01-2009, 01:20 AM	#7
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	Re: new engine ideas How much money you got? Cheapest route (assuming it runs well) is to back the I-6 with a 700R or 5 speed (seems to be more popular with the straight six crowd.) The 4.3 with a 5spd or 700R is another good option. Personally, if I had the extra $$$, I'd install a 5.3/4L60. 290 HP stock, fuel injection, OD transmission, it's just a little pricey for the set up and all the stuff to make everything work together. HOWEVER, if you do a lot of "city driving," under 45mph or so, you won't see much of a difference with any of these set-ups. __________________ 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; 02-01-2009 at 01:22 AM.

02-01-2009, 11:23 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: new engine ideas how many MPG you getting now? How much you looking to spend? How much MPG do you expect out of this truck?

02-01-2009, 12:09 PM	#9
LuckyHenriksen Registered User Join Date: Oct 2007 Location: Sherwood Oregon Posts: 1,908	Re: new engine ideas MAST motorsports put their L92 crate motor and the 6L80 trans in a '68 short bed, they got 17 MPG on the power tour, and that motor puts out 525 horses __________________ 1968 Yenko Chevy LWB 6.0L/TH400 3/4 Drop Senior Project Build Thread Here

02-01-2009, 04:30 PM	#10
Elephanthead Registered User Join Date: Nov 2008 Location: Carmel, IN Posts: 187	Re: new engine ideas I would like to drop in a 4 cylinder direct injection ecotec. VVT and fuel sipping economy, with my granny tranny, my c30 will still pull like a bull.

02-01-2009, 11:24 PM	#12
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: new engine ideas In theory, a larger engine in a smaller body will use less fuel to move it....in theory. The truth is that we tend to like the idea of a bigger engine and then we flog the crap out of it, just for tickles and grins.... My '96 GMC has a 4.3/AOD and I get about 17MPG around town, on average. Is that the kind of improvement you want....if it is an improvement? An acquaintance of mine used to race dirt track with motors that were built to be claimed (I think that is the right term). Anyway, he would start with a 4.3, add a pair of heads from a 229 V-6, do a little "finaglin'" and a little bit of exhaust work to pair up the right cylinders in order to achieve a good scavenging effect, then clean up on the track. So, the 4.3 can be made to run, and with a good transmission/final drive ratio, also made to be somewhat economical. Would I put one in my truck? What, and give up my V-8? Never happen, GI!! __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.

02-01-2009, 11:35 PM	#13
LuckyHenriksen Registered User Join Date: Oct 2007 Location: Sherwood Oregon Posts: 1,908	Re: new engine ideas Haha the way I drive I would be lucky to get 9 MPG out of a 525 horse motor __________________ 1968 Yenko Chevy LWB 6.0L/TH400 3/4 Drop Senior Project Build Thread Here

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