nomad88z

Alright guys, bear with me, I know motors, not electronics.

After years of contemplation, I have decided to rid myself of the absurd Speed Density TBI on top of my L98 350 (don't ask about that combo, long story) and replace it with a simple 600 cfm Four Barrel. I've read all about the process, and it should be simple for somebody with my experience.

So, my question lies with the wiring harness. Once I make the swap, can I remove it and throw it in the bonfire alongside the ECM, or do I need to keep it for certain electronic devices? If I do need to keep certain devices 'plugged-in', which ones?

Thanks guys.

jon murphy

I have done this several times .. you wont believe the power boost, at all rpms. You can block off a iron manifolds heat passages for more power (Not in freezing climates) I use a 1/8 inch hole usally. Use a older Qjet carb, most were 780 cfm and you can set the throttle plates a bit more open too . They allways out power Holley in Circle track tests and all other tests. Blocked off iron manifolds give the most power over a wide rpm band. Believe
me. Your new stall speed will be up about 10%

ntomsheck

iTrader: (1)

Yes and no. If you have dual electric fans, the first fan is controlled by the computer - you'd have to set that up differently. In 89 and lower, the windsheild wiper system was in the engine management harness (I would know, I just retrofitted a '90 harness in an '89 car). If you want wipers, you'll have to fix that. I assume you wont be using cruise (if you have it), so all that can be removed as well. On the bulkhead connector, which is the connector that goes through the firewall on the drivers side, a few wires are needed for power, so you'll have to route those and keep them, as well as the starter solenoid wire, and sensors. It's not as simple as just removing the wire harness, but the bulk of it is removed after some wire tracing.