i dont think youll break the 12 bolt, ive seen 10 bolt 8.5 diffs take 1000 hp if built right. probaly will break the driveshaft first. truck should be a monster

 

Thanks. The plan has been to make it as nasty as I can and still be able to drive it to the track...and most important, it must get me back home too. It actually does have a new shaft but its only a .083 wall steel shaft with 1310's and stock yokes. I wanted to upgrade to a stronger shaft w/1350's and forged yokes but decided to hold off...for the rear end upgrade I've told myself I'll need.
Keep in mind this is the "truck" 12 bolt...that actually has a smaller pinion shaft then the car 12 bolt.

 

I think you will be just fine, as long as your transmission doesnt shift so hard that it knocks you fillings loose. If you spray it later on then Id look into beefing some stuff up.

 

Looks good TXoldskool.

I also have a 1968 truck. Mine needs a motor, but I'm not sure which way I'll go with it. I have a big block ready to run and most of the parts to install it. But I'm still tempted to go the LS route sometimes.

I'd definitely like to swap in a 4-speed auto with a lockup converter. If I go with the big block I'll probably try to go with a 4L80E.

What headers did you use with your LSx motor?

Don't let the anti-carb people get you down. Most of them probably don't understand how well a carb can work and how much less trouble it can be. That 4-speed auto w/lockup will get you some good mileage with EFI or a carb.

 

I thought you were dropping the 6.0 into a late-model chassis and thought WHY but then I saw it was going into a '68 and I love the idea. All my experience is in EFI, but I do respect carbs and the old school days of modding, can't wait for more on this truck!

 

really less trouble. i dont ever have to adjust my injectors just turn the key and starts in any weather. my carbed chevelle on the other hand dont start it in a couple weeks and your screwed. also carbed your constantly tweaking tunning, and finding the right idle. if carb can be less trouble i think every manufacture should go back to carbs. i dont dislike carbs, i like my carbed sbc but its not less trouble, and would never think of putting one on any ls engine, leave that to old school sbc and bbc IMO.

TXoldskool not trying bash you, you have an awesome truck, looks to be comming along well.

 

A well setup carb can go many thousands of miles without touching it. I have a 1987 F-250 I bought new. It came with a Holley carb from the factory. Since 1987 I've changed the power valve one time and the fuel filter one time. Not bad after about 23 years. Today it can still set for months without being started and it will start right up every time in any weather. If it does give up someday it will be easy and cheap to rebuild and be ready to go again.

Until a couple of years ago my daily drivers always had carbs. I never touched them, and never had problems with them.

If you're having that much trouble with your carb you probably need some help.

I'd put a carb on a LS motor in a heartbeat if it seemed like the best choice for the project.

To go fast with a carb you don't need to waste money and time on a chassis dyno, various EFI parts and you don't have to pay a tuner big bucks or buy HP Tuners.

Don't get me wrong. I like EFI, but I'm not afraid to run a carb either. These days you can't mention a carb without the anti-carb foamers getting all worked up.

Anyway, didn't mean to trash TXoldskool's thread. Sorry. Again, nice truck!

 

No help needed here buddy, its plain and simple EFI is much more efficent then carb. I know you dont care what i think but i call BS on your 23 year maintenance free carb. If carbs have done you well, you might wanna consider swaping your EFI to a carb setup. With that said ill just turn the key and drive while your pumping that pedal to start. Oh and also you dont need a dyno to "go fast" many trucks have never seen the rollers and running pretty quick. I dont want to screw this thread up so im done with the EFI carb conversation.

Hey TXoldskool what headers are you using?

 

http://www.carcraft.com/techarticles...fi/index2.html

EFI vs. Carb myths and comparison test.

 

If you have to tinker with your carb all the time you obviously need help.

Any EFI trucks that are running quick and have never been on the rollers have still spent big bucks on tuners or tuning software and hardware.

You can call all the BS you want on my old Ford truck, but it's a fact. I've never adjusted the carb since I bought the truck and it still runs great. I did forget to mention that I've also replaced the accelerator pump. But the carb body has never been off the motor since new.

It's not that unusual for a carb to go a long way with no attention. My F-100 went 160k before I messed with the carb on it. I had an old Fairlane with a 6 banger that I drove for years and never touched the carb, sold it without ever messing with the carb.

Tear off EFI and replace it with a carb? You bet I would if I was building a drag car. For a daily driver?... I'd leave the EFI on.