Swapping a 4.3 to a 5.7 in a 2000 gmc

[dsplayer4u]

basically what im wanting to know is what i will need to buy/replace in order to drop a 5.7L in, thanx a bunch guy.

[RedHeartbeat]

You are talking a 5.7L LS1 I hope. You can do a 5.3 or 6.0L with about the same amount of work. I've not done a NBS conversion so I will let those that have speak up here.

[dsplayer4u]

my dad and i were hoping to do it sometime this summer so that we will have plenty of time to screw it up.........get pissed off.......then do it right....... ......if you have any suggestions about where to get started, they would be greatly appreciated

we r trying to keep it at around the 1500-2000 dollar range, is this a reasonable goal?

[Tim Z]

I f you already have the engine and trans maybe. Wiring harness/fuel system/Computer tunig are expensive but any thing can be done and we will try to get ya hooked up as cheap as possible. Tell us what your working on and what you already have to get the swap going.

[dsplayer4u]

first off im trying to c if we can keep anything out of the original......dont have n e thing started yet..........hoping ot get going seriously with this at the beginning of the summer......as of right now its just snooping around.....

and if im sounding completely dumb.....well its cuz i am lol, i dont know jack about trucks/cars/engines and all that.....i just know that i enjoy helping my dad out fixing what ever is wrong with the truck, so im interested in learning as much as i can about engines while we try to do our summer project.....

[superchargedemon]

you can do the swap with very little. I have a 2000 GMC sierra that was a 4.3L 5 speed manual, i put a 5.7L OSBC with a 4L80E in my truck. here is the list of things you need to do the swap

-350 motor of course
-350 vortech computer out of a 3/4 ton van or truck (12200411)
- PCM pinout of the computer for the 12200411
- trans dapt motor mounts for a S10 V8 conversion
- Map sensor wiring harness
- V8 injector pack wiring harness
- Crank shaft postion sensor wiring harness
- Cam shaft postion sensor wiring harness
-set of headers from a 99 3/4 ton pickup
- the exhaust needs to have the right ends for the headers which can be found on a 99 3/4 ton exhaust

the factory 4.3L front drive will fit the motor ever one knows that.
the water pump will work.
if the motor is equipped with a oil cooler you can use that or get the right piece to delete it
the 4.3L air intake system will work
the factory fan will have to be taken off and a electric fan will have to be used.
the factory fan shroud will not work. one of a 2001 3/4 chevy express can be fit to work.

if you have any question email me at speeddemon1356@hotmail.com

the factory 12200411 computer will have to reprogrammed for the truck cause the orginal van configuration runs to rich for the new chassis.
plus rear end gears and the vin will aslo have to be reprogrammed into the truck.

I have worked out all the bugs on my truck. the truck gets 24 mpg, i have a K&N cold air (4.3L) cermaic coated flow tech headers ( 99 3/4 ton truck), and I tuned the computer.

the whole swap took me bout 4-5 weeks to do. then 2-3 weeks working the bugs out of it.