Project 71 long time with 4.8 vortec swap!!!

[truckdude239]

not really i took out the rear cross sill out of the frame

[truckdude239]

i did run my fuel lines yesterday

[truckdude239]

got it running!!!!

My 71 c10 with 4.8l ls swap - YouTube

[bchaney]

Sweet

[mcbassin]

Originally Posted by truckdude239

got it running!!!!

Congrats! Cool video

[truckdude239]

Got my brakes fixed the rear hose was stopped up and got my new tag i can drive it on the road once i get my bed and lights wired up

[truckdude239]

71 c-10 4.8l frist test drive - YouTube

[truckdude239]

gagues came in its fun time

[truckdude239]

some more, yes i know not the prettiest wiring job but it should work

[ivorton74]

just got done reading the entire thread...I see u ran into a lot of headaches but u still got everything comin together nicely...any updates on this project? I just subscribed to this thread.

[truckdude239]

got some work done yesterday mounted the bed deleted the incab gas tank, installed mny tilt column and started polishing the wheels man some amazing polish took 90 percent of the rust off they aren;t perfect but alot better

[Average Joe]

Nice work. Congrats on getting her running.

[NastyBuzzard]

Nice job! I am wondering about doing a 4.8 swap in my 87 4x4 longbed but I am worried that it wont be strong enough...

[mcbassin]

Looking good. I am looking forward to driving my 4.8 one of these days.

[truckdude239]

I wouldnt worry about it the 4.8 i got is pretty torquey

[NastyBuzzard]

Originally Posted by truckdude239

I wouldnt worry about it the 4.8 i got is pretty torquey

I just want to be sure it can spin my tires if im feeling froggy and haul a trailer in my 1987 gmc single cab long bed 4x4 truck. 3.42 gears w/ 32" tires.

[truckdude239]

the 4.8 is rated for 270-290 hp 285-295lbs torque with is the same if not a little more then a stock 350

[NastyBuzzard]

Originally Posted by truckdude239

the 4.8 is rated for 270-290 hp 285-295lbs torque with is the same if not a little more then a stock 350

I am thinking stock tbi for my year was rated 190/210 hp and 300ft/lbs of torque. However its rpm "powerband" was from like idle-3000. That is why they feel so "torqy" but no power above like 3500rpm lol.

My problem is now, that I rebuilt a 350 tbi out of a 92 for my 87 truck. It was rebuilt with flat top pistons, .030 over, 193 swirl port heads and a vortec cam set up, the powerband of the truck isn't where it used to be. I am having low rpm torque issues where my torque isn't where it is supposed to be and I am having low rpm shifts that are causing the truck to "lug" until its back above 1500 rpm.

I have been fighting with that setup for over a year, I am at the point now I say screw tbi and I want to go to ls efi swap, even though my setup now has less than 10k miles. I am tired of putting $ in it trying to get it right.

[67c10rustbuket]

Originally Posted by truckdude239

the 4.8 is rated for 270-290 hp 285-295lbs torque with is the same if not a little more then a stock 350

Nasty-
I have been driving a 4.8l extended cab Silverado for the last year and a half-ish and can say it kills any 5.7 carb, throttle body, or mpfi 5.7 (gen1 motors) that I have ever driven. If you are concerned about it comparing to an '87 its not even close. '87 is an early TBI I believe rated for 200 hp. The 4.8 screams when you hit the gas and fries tires at will. I was very impressed with the 4.8l. I would not hesitate to drop a 4.8 into anything. They flat kick butt and are less thirsty than the 5.3l. I can tell my 5.3 has a little more torque and the 4.8 runs higher rpms but the 4.8 gets better mileage. It may just be mental but that's my story.


Nice build Dave, glad you got her running!

[truckdude239]

i was in the same boat sort of i built a 305 to replace me 307 while i drove it bored 30 over flat tops with stock cam and stock reworked heads i fought it for over 3 years trying tog et it running right sever different carbs different distributors different intakes finnaly my last straw was it sit for 6 months and went to fire it back up and it broke a push rod i was looking at about another 9 hundred doolars to rework the heads and a new cam and lifter sit and i said forget it i picked up my 4.8 with 4l60e computer harness pedal and tac module and all accessories expect for ac for 1100 dollars i been wanting to do this for along time all i got left now is tires exhaust and finish the main wiring for my rear lights

[NastyBuzzard]

Thanks guys!! I was worried about the 4.8 but yall have given me the confidence.

I am basically getting the whole truck minues hood,fenders,doors,bed for less than a $1000 and it runs and drives, I played with it yesterday. So the 4.8 is how I am going then. I just wanted some testimonials.

I may research a "towing" cam for the 4.8 but thats about it. I also heard that from deleting egr, emissions, and cats that it will gain around 40HP w/ exhaust. This truck I am buying already has true duals on it.

I had a 01 single cab step side silverado w/ 4.8 I could squeeze 25mpg out of on a good day! But it didn't like hills at all and when I tried to tow a 16' car trailer it didn't like that either but I am thinking it had like 3.08 gears or something.

[Ghostryder79]

So...I read this thread, and immediately wanted to know more about the 4.8 swap. An LS is in my long term goals, and now I have more information. Perhaps this might help any of you in your quest for the right engine for you.


http://www.superchevy.com/technical/...e_ls_slugfest/

[NastyBuzzard]

I started a build thread but so far it's going slow until I can determine condition of the 4l60e! Once everything is running perfectly I can gonna put it in overdrive! Pun intended!

[truckdude239]

Got the rear lights and fuel tank wired up moves under its own power now


http://youtu.be/FQlien2kLfM

[Palf70Step]

Good to see her rolling again!