[RamAirZ]

Originally Posted by FLYNLOW

I'm also thinking about keeping my BTO 2004R instead of the 4L60, just because its already built to Stage 3 specs. Assuming I do keep the 4L60E, Besides VATS(they have that VATS thing on ebay), and the rear 02's(sim's?) what specifically will need to be changed regarding the harness and the PCM? What might it be looking for that I could swap over?

And further more,whats involved with modifying the harness? I found all the pin-outs over on LS1Tech, do I simply remove whatever wires I don't need? Ideally I'd REALLY like to do this, to get it in and running, as quickly and as cheaply as possible. I can tidy it up later. If it simply means pulling the wires, or even just leaving them disconnected and bundled up, I'll do it. Theres not a lot emissions wise on the LS1, and most of it looks like it will swap to the '73 fairly easy, with the exception of the evap system and the rest of the gas tank. Still not sure how I'm going to do that, Any ideas? I looked closer at the two tanks last night and that LS1 tank is tall, I don't think the fuel pump/sending unit it even going to be possible to make it work in the '73, and the only way to get the LS1 fuel tank into the '73 would be to cut the trunk out. I don't really wnat to do that, even though I cant remember the last time I even opened the trunk.
The other option is to keep my existing tank and put on an external fuel pump (Walbro 255?)Now, how would I do the return? I notice theres a "T" fitting under the 01, is that how the 01 regulates it's fuel return? If possible I'd like to keep that. The idea is to buy as little new parts as possible.

Thanks guys.

I removed all the unneeded pins from the computer and pulled all the wires through the harness out. The hard part for me was that my harness didn't come with the interior part that had the OBDII port. Since you have all of that yours should be pretty straight forward, just mkae sure to get power to all your power wires and of course ground your grounds lol. There are a couple constant and some ignition powered wires in the harness. I just ran a distribution block with fuses and ran all my wires to it. Had one main wire from the battery running to the fuse block. On the fuel side, you could easily run an inline fuel pump with your factory tank, instead of having to swap gas tanks. You could always pull the pump out of the LS1 car and modify your factory tank to hold it (I've seen that a few times). I personally am going with a sump kit and running braided lines to my A1000 pump, but I'm also going for forced induction so I want all the stuff I can get to keep it safe lol. If you have any questions shoot me a PM, I swapper an LS1/T56 into my 87' Iroc and it was originally a 305TPI/700R4 car