LT1 Rebuild & Swap into 3rd Gen
#122
TECH Fanatic
iTrader: (4)
You can just pull those pipes out completely. Even the short thick upper radiator hose one will come out. Then run a tap through the holes then put a pipe plug in any you're not using. That will last much longer than those caps.. The holes in the water pump once you get the pressed in pipes out are all NPT of various sizes.
Since you asked for the routing:
Here are the heater hose and radiator hose diagrams for 95-97:
http://shbox.com/1/heater_hoses.jpg
http://shbox.com/1/95-97_hoses.jpg
Since you asked for the routing:
Here are the heater hose and radiator hose diagrams for 95-97:
http://shbox.com/1/heater_hoses.jpg
http://shbox.com/1/95-97_hoses.jpg
Last edited by Z28Roxy; 11-17-2022 at 07:52 AM.
#124
On The Tree
Thread Starter
For the steam pipe, Ive decided I'll just drill a hole in my aluminum radiator and braze in a 5/16 aluminum hose barb in the same location as OEM 4th gen radiator. I have the 4th gen radiator and fans out of the donor car but I figure my big alum radiator probably is twice as effective. Not sure how well the stock would hold up. Maybe its good as a backup?
I will thread and plug thosewater pump ports later once I get the car running. Right now Im in a sprint to get her to fire up.
I did find the 1310 / 1350 combination universal joint by Moog so that I can use the 4th gen tranny yoke to the 3rd gen driveshaft. Also got the fuel hoses sorted out.
Got a question about exhaust manifold flanges. Kinda hard to find specific LT1 flanges. My donor had long tubes. So am I supposed to go to a JunkYard and find a 4th gen and cut the flanges off? Its a ball and socket fit right? Muffler shop guy cringed a little bit when I told him what I was doing acting like the LT1 manifold was a "special" thing. Most peeps here probably just upgraded to headers and dont have to worry about OEM connections, but I dont have that option.
I will thread and plug thosewater pump ports later once I get the car running. Right now Im in a sprint to get her to fire up.
I did find the 1310 / 1350 combination universal joint by Moog so that I can use the 4th gen tranny yoke to the 3rd gen driveshaft. Also got the fuel hoses sorted out.
Got a question about exhaust manifold flanges. Kinda hard to find specific LT1 flanges. My donor had long tubes. So am I supposed to go to a JunkYard and find a 4th gen and cut the flanges off? Its a ball and socket fit right? Muffler shop guy cringed a little bit when I told him what I was doing acting like the LT1 manifold was a "special" thing. Most peeps here probably just upgraded to headers and dont have to worry about OEM connections, but I dont have that option.
#126
On The Tree
Thread Starter
#127
On The Tree
Thread Starter
Finished items:
Spark plugs and wires
Fuel line & connections
Power Steering Lines
Still have a long list of items to work through. I did a little junkyard recon and found an LT1 Firebird today and it’s engine transmission and original exhaust are fully intact. Gonna go back tomorrow and strip it’s exhaust O2 sensors, driveshaft, alternator, throttle cables and brackets maybe a few other items.
1995 Impala SS power steering line.
Power Steering Reservoir mounted.
Spark plugs and wires
Fuel line & connections
Power Steering Lines
Still have a long list of items to work through. I did a little junkyard recon and found an LT1 Firebird today and it’s engine transmission and original exhaust are fully intact. Gonna go back tomorrow and strip it’s exhaust O2 sensors, driveshaft, alternator, throttle cables and brackets maybe a few other items.
1995 Impala SS power steering line.
Power Steering Reservoir mounted.
#129
On The Tree
Thread Starter
Should I have taken the exhaust manifolds for spares?
Add a driveshaft with yoke and ujoints. Super excited to have found this exhaust.
#131
On The Tree
Thread Starter
4th Gen Throttle cable was not really gonna work, so I did some cutting and welding to the 4th Gen bracket to make a square receptacle for the 3rd Gen cable. Works perfect.
A quick check to make sure it was opening fully.
Also a few weeks ago my wife worked on this project with me. She cut the instrument panel up to install this tachometer and install the light. Perfect. Love it. Never had a tachometer in my racecar before.
Also had to get a longer clutch hydraulic hose in order to reach the T56 slave location. Now the clutch is working. I didn’t even bleed it. Strange.
Got all the gauge senders hooked up and torqued. Coming along.
A quick check to make sure it was opening fully.
Also a few weeks ago my wife worked on this project with me. She cut the instrument panel up to install this tachometer and install the light. Perfect. Love it. Never had a tachometer in my racecar before.
Also had to get a longer clutch hydraulic hose in order to reach the T56 slave location. Now the clutch is working. I didn’t even bleed it. Strange.
Got all the gauge senders hooked up and torqued. Coming along.
#132
On The Tree
Thread Starter
Steam pipe fitting brazed in.
Test fitting rad hoses. Gonna have to buy new hoses. Will have to play mix n match to get it right.
My checklist of to-do’s. Most items are pretty simple. The wiring and Reworking the LT1 harness is a little intimidating but I’m gonna give it a shot.
#133
TECH Resident
LT1Swap.com has alot of info on the harness.
#134
On The Tree
Thread Starter
Absolutely. That’s my go to source. I just don’t know if the ECMs I have are w
frim what year and if the harnesses I have match and what year they are from. But yea, most of what I need is there. Kinda saving it for last I guess….biting my nails.
frim what year and if the harnesses I have match and what year they are from. But yea, most of what I need is there. Kinda saving it for last I guess….biting my nails.
#135
TECH Resident
Pink goes to fused/switched ignition
Orange goes to fused battery
Lay the bare harness on the engine, connect the connectors, hookup the engine grounds, wires from the factory fuse box as above. It will run.
I have a LS truck harness I trimed down to the bare minimum, no 02s, no MAF, just crank, cam, map, tps, cts, injectors, coils and fuel pump that I use to start engines on a test stand.
#136
On The Tree
Thread Starter
GM is pretty hard to mess up. While I trace harness connections and pinouts to be sure as a general rule.
Pink goes to fused/switched ignition
Orange goes to fused battery
Lay the bare harness on the engine, connect the connectors, hookup the engine grounds, wires from the factory fuse box as above. It will run.
I have a LS truck harness I trimed down to the bare minimum, no 02s, no MAF, just crank, cam, map, tps, cts, injectors, coils and fuel pump that I use to start engines on a test stand.
Pink goes to fused/switched ignition
Orange goes to fused battery
Lay the bare harness on the engine, connect the connectors, hookup the engine grounds, wires from the factory fuse box as above. It will run.
I have a LS truck harness I trimed down to the bare minimum, no 02s, no MAF, just crank, cam, map, tps, cts, injectors, coils and fuel pump that I use to start engines on a test stand.
Good to know. I kinda noticed this from pulling the TPI harness from the car. Thanks for solidifying that. I think we will be fine. Take me a day to remove the unneeded circuits and whatnot and then I’ll throw her on.
#138
On The Tree
Thread Starter
The cavalier slave has a larger diameter piston which produces a shorter throw.
#139
On The Tree
Thread Starter
Everything is done up to wiring.
Sonnax yoke with 1310/1350 combo joint pressed in. Dang press bottle Jack took a crap. Had to buy a new 20ton bottle Jack. Eh well. Got er done.
Installed and torqued. Also got the torque arm installed and torqued.
Exhaust manifolds installed and torqued. Alternator bracket installed, Hoses are tight, Starter installed and torqued.
Sonnax yoke with 1310/1350 combo joint pressed in. Dang press bottle Jack took a crap. Had to buy a new 20ton bottle Jack. Eh well. Got er done.
Installed and torqued. Also got the torque arm installed and torqued.
Exhaust manifolds installed and torqued. Alternator bracket installed, Hoses are tight, Starter installed and torqued.
The following users liked this post:
SS RRR (11-24-2022)
#140
On The Tree
Thread Starter
GM is pretty hard to mess up. While I trace harness connections and pinouts to be sure as a general rule.
Pink goes to fused/switched ignition
Orange goes to fused battery
Lay the bare harness on the engine, connect the connectors, hookup the engine grounds, wires from the factory fuse box as above. It will run.
I have a LS truck harness I trimed down to the bare minimum, no 02s, no MAF, just crank, cam, map, tps, cts, injectors, coils and fuel pump that I use to start engines on a test stand.
Pink goes to fused/switched ignition
Orange goes to fused battery
Lay the bare harness on the engine, connect the connectors, hookup the engine grounds, wires from the factory fuse box as above. It will run.
I have a LS truck harness I trimed down to the bare minimum, no 02s, no MAF, just crank, cam, map, tps, cts, injectors, coils and fuel pump that I use to start engines on a test stand.
1. Does the ECM need any of the VSS signals. I dont need/want speedometer so, can I delete the T56 wiring altogether without any issues from ECM????
2. Can i run my separate standalone relays for fuel pump and radiator fans? (I read something about a quad driver module code would be thrown). I dont care about CEL, but will ECM still function normal?
My makeshift wiring desk.
Last edited by 64GunPilot; 11-26-2022 at 10:24 PM.
The following users liked this post:
SS RRR (11-27-2022)