Chevrolet S10 V8 pickup designed for maximum gas mileage !!!!

[gumby79]

Roller cam, reduced friction and you dont need the additives to keep the cam alive fuel is not the only thing to consider in hypermiling.
2010 oil report

4 Barrel carb a 500cfm carb only has 125cfm per barrel summit racing used to have a 350cfm 4b Holly avaliable (was going to put it in place of the Holly 4412 /500cfm on grandmas 61GMC 1/2T 305b v6) . if you can stay out of the 4 it is smaller more tunable. In anEdelbrock all4 are the same size. I'd go with a rodchester ,supper small primary huge secondary .dirve it on the primary.
Msd 6 Digital has built-in 2stage revlimiter primary for broken driveshaft protection secondary for lowning out the vehicle
Timing retard add nock sensor or micro switch to the carb linkage + your desired toggle.. and a 20° retard in start-up mode
Rpm
the 350 I had in my79 K-20was happy @400 the alt was happy at 600 rpm https://alternatorparts.com/alternator-pulley-size.html theas guys have the overdrive pully for your alternator to allow your desired ultra low idle

[elhigh]

Knoxville at 50, hey? Sounds like you're spending most of your time on Middlebrook Pike.

Don't be too creeped out, I work in Knoxville.

I know you like the older engines and I totally get that, and for my money I would say stick with the 305 you already have on hand. The volume/surface area ratio in that engine isn't too bad, so you don't lose quite as much heat through the cylinder walls. And the depth of support for the SBC is huge, so someone, somewhere has already done whatever you're going to do and you have a shot at picking that guy's brain for advice if you need it.

Having said that, consider an LLV, the big 2.9l four-banger the General screwed into the Colorado/Canyon twins. That's a bigger truck than your S10, but the engine's power output is right in line with what you're shooting for. You'll save about 150 lbs over just about any SBC, nearly the weight of an entire passenger. You'd have to swap over the EFI system but that just opens up all the EFI tuning options to you, and in that regard I just have to echo what everyone else has said: you're better off injected if you want the best possible economy.

[oil pan 4]

When GM switched over to the rooler cam in sbc in the 90s they said it would give about a 1 to 1.5mpg improvement.

[bandit86]

Originally Posted by 19bonestock88

I was thinking about that myself... If staying with such small displacement, why not do up a nice 11:1CR, low RPM cam, 4.3 V6? Same displacement as that v8(nearly), but less frictional losses due to two less cylinders... I'm still in favor of a small displacement LS swap though

I'm not a big fan of the iron dukes, but from a boat you can get a 3.0L 4 banger that is similar. That could be fun in a s10

[JRMichler]

Originally Posted by elhigh

Having said that, consider an LLV, the big 2.9l four-banger the General screwed into the Colorado/Canyon twins. That's a bigger truck than your S10, but the engine's power output is right in line with what you're shooting for. You'll save about 150 lbs over just about any SBC, nearly the weight of an entire passenger. You'd have to swap over the EFI system but that just opens up all the EFI tuning options to you, and in that regard I just have to echo what everyone else has said: you're better off injected if you want the best possible economy.

My Canyon has the 2.8L previous version of that engine. It has plenty of power and torque. I keep up with traffic shifting at 2500 RPM, 3000 if I'm pulling out onto a highway. I've wondered what mileage I could get if I had that engine in a smaller truck such as an S10, especially if I added the six speed manual transmission from the new Chevy Colorado connected to a 3.42 rear end.

Please do this, I want to see the results.

[spdfrk]

I have had some great luck with an L05 350 with the 7747 ecm and lean highway mode paired with a Mallory Hyfire VIA msd. Don't be scared of the EFI. It's very simple with a little bit of effort. The 3.08 is great!

[elhigh]

Originally Posted by JRMichler

My Canyon has the 2.8L previous version of that engine. It has plenty of power and torque. I keep up with traffic shifting at 2500 RPM, 3000 if I'm pulling out onto a highway.

Your truck was what I was thinking of when I made the suggestion. His S10, even if he has the heaviest one, is already at least 400 lbs lighter than your truck (when it was stock) even if you have the lightest one. The Atlas engine is going to feel like a really lively mill in that circumstance.

[19bonestock88]

If were talking about swapping a modern four cylinder in place of an old one, I have to vote for the 2.4liter LE5... It's got variable valve timing and runs pretty efficiently in the cars they come in... Out of the box(in the cars they originally come in), they're good for 170-175hp and 30+mpg... Half the frictional loss of a V8, and enough power to motivate an older S-10... In fact, I'd love to dig my old Ranger out of the weeds and do a retrofit on it... There are off road swap harnesses made by Alpha Fab industries, so swapping one of these into even the oldest of compact truck becomes just a matter of making it fit...

[Bassdoctor]

Tonight I'm tearing the 267 down to see it's condition. I have a ton of racing parts that I could use like 40 pound cranks and light weight rods. I'm looking at several cams and think a flat tappet is the way to go due to reduced spring pressure. I have a Comp 260HR but feel it might be too big. 206/206, .500/.500, 110 LSA.
Lunati makes a fuel milage cam 245/255,195/205,.405/427,108/116, LSA =112.
I think I can get 300 lb. ft. Of torque out of it.
A 3.75 stroke crank would give me about 12% in crease in torque too.

[bandit86]

Screw that, build a 406.