Need help identifying a TPI manifold - Third Generation F-Body Message Boards

NapaBavarian · 02-17-2010, 11:08 AM

I have a TPI manifold that has been sitting in a box since I got it probably 6 years ago and I'm trying to identify it so I can install it on a truck engine for my '75 step side Chevy 4x4, I'm trying to figure out what harness and computer I need to get as well.

Here is what I know:

Late style intake manifold 87+

Fuel injectors are gray

Has an AIR MASS METER

I will be installing this on a 1995 L05 long block I pulled from a wrecked Suburban.

It is apart on the work bench, so any needed information is easy to get!

S10Wildside · 02-17-2010, 12:29 PM

Unless the injectors were swapped, the gray injectors tell me it's an 89 TPI intake.

You can use the following computers...
- 85 TPI
- 86-89 TPI (1227165 ECM)
- 90-92 TPI (1227730 ECM)
- 90-91 TPI (1227727 ECM)
- 96-99 Vortec ECM (requires 4x crank reluctor and Vortec distributor)
- LS1 PCM distributor application (GM# 12200411 with 4x crank reluctor and Vortec distributor)
- LS1 PCM distributor-less, coil per cylinder (with 24x crank reluctor)
- LS3 ECM distributor-less, coil per cylinder (with 58x crank reluctor)

The TPI manfiold has little to do with the ECM used to control the system.

NapaBavarian · 02-17-2010, 06:33 PM

Thanks, does that include 305 computers? I can't tell if they are different.

MADMAXGTA · 02-17-2010, 07:13 PM

I "THINK" The computer for a 305/350 are the same. The only difference is in the Prom ( aka chip).

1brd2brd3brd4 · 02-17-2010, 07:29 PM

I put a 305 TPI out of an 85 Z28 in my 85 K5 Blazer, I use a painless harness for a 91-92 so I wouldnt have the MAF hanging off the front of the engine. It kinda cleans up the engine bay. And also was able to use the intake boot and 3 inch exhaust to make Cold air snorkle.

Chevy86 IROC-Z · 02-17-2010, 09:36 PM

TPI computers are almost the same. But they are interchangable. Difference is the PROM. 350 PROM matches 22 LBS injectors while the 305 PROM matches the 19 LBS. I believe the TBI computers are different due to the fact that there different parts as in fuel and air intake delivery. If your very serious about changing to a TPI system, then follow this link....
http://sethirdgen.org/tpi1.htm

Shadygrady · 06-08-2010, 03:56 AM

What?????

Look for some kind of part numner.A pic would help.Do you believe it to be a stock unit or aftermarket?