link85x

iTrader: (1)

Hey everyone. I just snatched up a steal this past weekend. I got an LT1 from a 94 Caprice Interceptor, complete engine, along with wire harness for a $100!!! The things is that the motor ran, before pcm was taken. I gotta several questions about swapping it into my 90 RS:
(1) I know I need a pcm, but as far as wire harness goes, all i need is the entire engine harness to complete the swap, right? I wouldn't need the dash harness from the caprice (i hope not, because i can't get it now)?
(2) Will my T-5 bolt up to it? Also, are the starter bolt holes from a gen 1 small block and gen 2 the same?
(3) The wire harness. What all has to be done? How much rewiring will i have to do. I know c100 and c207 will have to be tinkered with, but what else. Vehicle unfortunatelt has VATS, so i now this my pose to be a problem.
(4) I should still be able to use fuel pump from the MPFI 3.1, correct? I read somewhere that the fuel pump from a TPI car can be used for an LT1. I also read on ALLDATA that the TPI and MPFI cars use the same fuel pump that pumps out about the same amount of fuel. I'm assuming that I can use it?
(5) Do I need any of the V6 engine harness? Because it is really hacked up and most of it can't be identified (it can be, but...).
(6) I know some custom fuel lines need to be made, from where they come from the tank to the engine bay. Does any make those?
(7) A/C is gone, thank god, but will i need to make some power steering lines? I noticed it's located on the other side of the motor, compared to my 305/3.1.

And thats pretty much all i can think of for now. I've already swap in my LB9 from my 87 IROC, so i've already swapped suspension and motor mounts, which i've already found out that they are completely the same. I can't the LB9 running (very close though), but i ran into this LT1 and decided it may be better for me to swap this in. That way I only have to mess with the wiring once, since i have to do some rewiring for the LB9, since it was an MAF engine and the 3.1 was speed density. Any help pleasee?

link85x

iTrader: (1)

Anybody?

Firebat

iTrader: (7)

ok.

1) no, a dash harness is not required but desired
2)T5 will bolt up but will need to do something about the vss - Send a PM to TexasLT1 about T5's. I think most gen i, gen ii starters are swappable???
3)All power wires, wires for the gauges, wires for fuel pump, wires for vats. Vats can be programmed out, no biggie, probably want to wire up the connector for the data port.
4)YES
5)Cut it up after you are done and everything on the Lt1 works, just in case. You'll still need the a/c wiring, if you use that.
6) Send a pm to t.g.o. member Z 2 8 R I C E R, and use no spaces.
7)go here: https://www.thirdgen.org/forums/ltx-...-steering.html

bingo

iTrader: (2)

You will need a V8 bellhousing and a flywheel far a 1 peice rear seal block. T56 flywheel will not work. You also need V8 motor mounts(both halves). If the LT1 came with a power steering hose you can use it. The Caprice uses the same fittings as a third gen. I didn't cut or even touch my dash or dash harness.

link85x

iTrader: (1)

What i should have also stated is that i swapped in my LB9 before hand. Mounts, V8 T-5, IROC suspension, etc. Thanks for the responses guys. I'll keep you posted.

Klortho

Get an F-body engine harness, '95 model since it would have the right opti plug on it. If you don't have A/C you will need a delete bracket to keep the belt routing correct (only one way to route the belt on a B or F-body engine) Best thing, dump the V6 pump and put a Walbro in tank, the pumps are different between V6 and TPI cars, trust me on this one, two different part numbers. Fuel lines if you had an MPFI car, all the lines you need are already there, just need adapters to go from the hardlines in the engine bay to the motor. Get an LT1 starter, 119 bucks at Autozone (+60 for a core if you don't have an old one) it's a mini hi-torque starter that will clear everything that the big old bulky starter won't, plus you're turning over 10:1 compression with it, torquier is better.

snake70

you seem to know a lot about this i have an 89 rs 2.8 blew the motor just got a parts car 94 buick roadmaster with a 350 lt4 what do i need to do to change it over it? the buick is complete and runs strong but was in an accident and cant be driven

raceclean

With respect to making the T-5 work. First off, I wouldn't recommend it. The T-5 is weak and even a stock LTX engine will destroy the gears. The tranny itself will fit, but if you plan on doing any power mods whatsoever, I'd go the a T56 swap. Stronger, better gas mileage and better cruising ability. I've read that people that have done the T56 swap in third gens, even on L89 motors are cruising at like 2K RPMs and getting 25-26 MPG on the highway That;s just my 2 cents.

Mdenz3

iTrader: (7)

Yes a GenI started will bolt right up to the LT1

Klortho

It will bolt up, but you're using an old style, non hi-torque starter to turn over 10.5:1 compression and probably won't last too long. Plus the headers are a tight fit anyway and the big starter will get hot from being really close to them.