I've posted messages about this before and I still have some questions. I currently have an 84 Camaro sport coupe with a carbureted 305 (LG4). I have recently pulled out a 350 TPI motor out of an 89 Trans Am GTA and a 305 TPI motor out of an 85 IROC. I took the engine harnesses and computers out of both. I even took the dash harness from the IROC. I will be putting in the 350, and using parts from the 305 if necessary. My questions are:
1. Are the dash harnesses between TPI and Carb different in any way? Will I need to replace mine?
2. What have you guys done with the fuel situation - did you just use a stock TPI tank with the pump inside? Did you use the TPI fuel lines, or order new ones? If so, where?
3. What else am I going to need? Any other problems I may come across? ANY help would be GREATLY appreciated. Thanks.

 

as far as i know three isn't any differances in the harness for the dash. each engine has it's own unique harness going from the engine sensers to the ecm. i think the tanks are differant between carbed and efi cars. if so swapping tanks would be the easy way to go. i'd replace the fuel pump while i was doing it to be safe. not sure if you'd need a new (larger) line or not. if you would easiest thing would be to run new hard line, i don't think you can buy prebent replacement lines.

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ICON Motorsports
1st & 3rd

 

The dash harnesses are only slightly different, so its easier just to modify your current one, than to swap it out.

As for the fuel, the tanks are the same, but the sending unit is different. I bought a fuel sender and fuel lines from thirdgenparts.com for dirt cheap. New fuel lines are available from GM, but your looking to spend about $100 for all seven of them, which woulndn't inlude the sender. Shop around the boneyards and such for one.

I did the same swap 6 weeks ago, so it is still a little fresh in my head.

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If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Thanks for the info. What is different about the dash harness? And, would it be wise to use used fuel lines? I have a set from the IROC, but they are rusted. Thank you.

 

What is different between the TPI dash harness and the carb dash harness? Thanks.

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1984 Camaro Sport Coupe - 73K Miles
5.0 Carbed LG4
COMPLETELY stock except for a K&N Air Filter
F41 Suspension Package
700R4 Tranny
3.08 Rear End
New Paint
Best 1/4 Mile Run:
16.760 @ 80.74 MPH

Coming Soon:
350 TPI
Complete 3" Exhaust System
Aluminum Drive Shaft
3.27 Disc Brake Posi Rear

 

I did the swap on a 86 Camaro from LG4 to L98. The dash harnesses are differant I can tell you but don't replace it, modifiy it.
Here's the differances I found on my car using the factory service manual. http://www.geocities.com/millicanga/TpiWiring.jpg

The C207 and C221 connectors are on the engine harness next to the computer. The panel harness will have the C207 but not the C221.
The dashed wires are existing and the solid wires are new.
E-mail me specific questions if you have problems.


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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Trick Flow Twisted Wedge G2's, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Dynomax Cat-back, Serpentine Belt Setup, Dual IROC Fans, Jamex springs, 16" IROC Rims, 36mm/24mm Sway Bars, Global West Steering Brace. Hotchkis Rear LCA's,Panhard Bar and SFC's.
http://www.sethirdgen.org/octride.htm

 

Thanks John. The reason I didn't give specifics was because I didn't use a factory harness, I used Painless Wiring harness #60103 so what I had to modify would be different.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Thanks for all the info guys. I really appreciate it.