View Full Version : TPI Question

05-26-2006, 09:19 AM
I am wanting to put a TPI set up on a SB400 thats in my 81 SSB 4x4. The carb has problems on very steep inclines. I just picked up a complete 1987 TPI 305 from a Firebird (cheap). Will the 305 stuff work or do I have to upgrade to 350 stuff ie. injectors, throttle body, etc. The truck is used mostly off road. I am after bottom end power.

Any advice will help. Thanks

05-26-2006, 09:27 AM
did u get the intake??????????i am preet sure u can not bolt a tbi carb on to a old style intake!!!!!! i might be wrong........i u cannot u need the intake and the intakes the bolts go straight down instead of on a angle like old school.....................[51]

05-26-2006, 09:29 AM
The 305 stuff will work have done the same onto a 383 sbc the only downfalls of the 87 TPI that I will warn you of is the 87 intake is for the later style heads so the middle 2 bolt holes on each side are at a different angle than the 86 and prior stuff, and the 86 to 89 TPIs are a Mass Air type injection so they have a Mass Air Flow sensor which are fragile (Don't like to be shaken around or water) and expensive. You might want to consider a larger throttle body too for the 400.

I used the computer for the 90 to 92 TPI when I built mine they use a MAP sensor a lot less fragile than the Mass Air Flow sensor.

05-26-2006, 09:34 AM
why not just run tbi?

05-26-2006, 09:36 AM
Because TPIs are way cooler and are multi point injection

they make more power and look way better

05-26-2006, 09:40 AM
TBI would be easyier. I have talked to alot of people that have the TBI and they complain about worse fuel mileage vs carb. I also think the TPI is a better system.

The only other way would be propane.

05-26-2006, 09:47 AM
Nutbar.... I know about the intake bolts. The manifold can be modified to fit? I also heard the LS1 intakes are better and bolt on, but are exspensive. I have another SB400 in a parts truck that I was thinking of doing the install on first, before taking mine apart.

The more info the better. We will have to get together for some beers.

05-26-2006, 09:57 AM
As far as I know the Firebird was an 1987.

Block 14093627 1988 - 1994, 305
Block SDK 1987 - ? LB9 305 Firebird
Heads 14101081 1986 - 1991 305 1.84/1.5001 EFI Std Port

Whats the diff between std and swirl port?

05-26-2006, 09:59 AM
Yeah you can grind the manifold holes a little to fit and I believe Holley or Edelbrock make some angled inserts to modify the manifolds to fit either way.

I have never used the LS1 stuff myself but my set up on my 350 in the CJ is actually a 86 manifold and sensor set with a 90 computer and my own harness built from the harness out of a pontiac 6000 2.8. What I do know is that 90% of the GM fuel injections use the same values for the sensors so most of the time it is just a matter of changing plugs to fit sensors and the computers will work.

My 383 that I have, has the Edelbrock TPI manifold set and the Computer from an 88 Blazer TBI with a custom Jet Performance chip built to my engine specs to make the TBI computer into a multi port controller

05-26-2006, 10:23 AM
ls1 is newer gen 3 small block and wont work.

05-26-2006, 11:00 AM
NO IT WON"T WORK, give it to me[f]

05-26-2006, 11:30 AM
You can have the 305. I will keep the rest of the stuff ..... :D