Author Topic: 305 carb to 350 tbi swap  (Read 6049 times)

Offline Gusgusa1

  • Newbie
  • Posts: 96
  • Gasket
305 carb to 350 tbi swap
« on: September 29, 2013, 10:34:44 pm »
I did some searching already but feel free to direct me.  I have an 84 k10 4speed I plan to swap out the 305 carb for a 1987 350 tbi.

Question is will it be a straight swap aside from the harness and ECM. Do accessories like distributer and water pump interchange? What about mounts?

2002 gmc 1500hd 6.0 4x4
1987 gmc Sierra classic 1500 350ss 4x4
1986 silverado 350 4x4
1984 scottsdale 305 quad jet 4x4 4spd manual
1982 camaro z28 350 w vortec heads spool

Offline Gusgusa1

  • Newbie
  • Posts: 96
  • Gasket
Re: 305 carb to 350 tbi swap
« Reply #1 on: September 29, 2013, 10:38:34 pm »
Sorry and the fuel pump. I believe they are located in the tank for the 87 but on the firewall for the 84 can I use the same one or upgrade it to keep it on the firewall?
2002 gmc 1500hd 6.0 4x4
1987 gmc Sierra classic 1500 350ss 4x4
1986 silverado 350 4x4
1984 scottsdale 305 quad jet 4x4 4spd manual
1982 camaro z28 350 w vortec heads spool

Offline Fairlane514

  • Frequent Member
  • **
  • Posts: 493
  • Newbie
Re: 305 carb to 350 tbi swap
« Reply #2 on: September 30, 2013, 05:49:55 am »
Never heard of a factory fuel pump on the firewall. For the TBI you will need an electric pump.

Offline Gusgusa1

  • Newbie
  • Posts: 96
  • Gasket
Re: 305 carb to 350 tbi swap
« Reply #3 on: September 30, 2013, 08:42:39 pm »
Does anyone know about the water pump and distributer and alternator. If I can keep down the cost by reusing these it would help a lot.
2002 gmc 1500hd 6.0 4x4
1987 gmc Sierra classic 1500 350ss 4x4
1986 silverado 350 4x4
1984 scottsdale 305 quad jet 4x4 4spd manual
1982 camaro z28 350 w vortec heads spool

Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18454
    • http://www.73-87chevytrucks.com
Re: 305 carb to 350 tbi swap
« Reply #4 on: October 01, 2013, 07:25:07 pm »
The distributor is specific to the TBI.  If it is running non serpentine water pump won't matter.

Chris Lucas
73-87chevytrucks.com
captkaoscustoms.com
squarebody.biz


Offline Stewart G Griffin

  • Senior Member
  • ****
  • Posts: 3324
Re: 305 carb to 350 tbi swap
« Reply #5 on: October 04, 2013, 10:07:27 pm »
If swapping to TBI, i would call these guys and do it right:

http://howellefi.com/


Offline Captkaos

  • OWNER and Administrator
  • Administrator
  • Senior Member
  • *****
  • Posts: 18454
    • http://www.73-87chevytrucks.com
Re: 305 carb to 350 tbi swap
« Reply #6 on: October 05, 2013, 11:19:46 am »
Howell only does harnesses, if you already have a working one why buy a new one?

Get everything from a donor and it should work. 

Offline Gusgusa1

  • Newbie
  • Posts: 96
  • Gasket
Re: 305 carb to 350 tbi swap
« Reply #7 on: October 05, 2013, 11:36:32 am »
Sorry I should have mentioned the motor I am getting is coming with the harness and computer. Thank you for the info so far
2002 gmc 1500hd 6.0 4x4
1987 gmc Sierra classic 1500 350ss 4x4
1986 silverado 350 4x4
1984 scottsdale 305 quad jet 4x4 4spd manual
1982 camaro z28 350 w vortec heads spool