[454Chevy]

Originally Posted by Blue Bowtie

You're going to have to REALLY want to perform the swap in order to see it through. The engine and transmission should bolt in just like it was made for it so long as you use the V-8 mounts for the truck. You may have to alter the position of the transmission mount or crossmember, depending upon which transmission is currently installed. Adding an expansion tank for the cooling system, and mounting the twin electric fans should complete the bulk of the hardware changes.

Fortunately, the 1983 should already have an ECM installed, so some of the necessary wiring will already be present, and the mounting for the ECM can be used for its replacement.

Beyond the mechanical changes and plumbing, you'll need to install an electric fuel pump in the tank (or near it), install all new fuel lines including a fuel return line, install a wire harness for an LT1, and install either a PCM or ECM to control it all. It is far easier to use a 1993 Y-Body ECM and reprogram accordingly. The later PMs are a little less forgiving.

As part of installing the wire harness, you'll need to install an extra brake pedal switch, provide extra fuses for the injector power, ECM power, transmission power (if you're using an automatic), and install an electic speedometer to accept the VSS signal.

Having a complete engine, transmission, cooling system, fans, and a complete wire harness with all the sensors and relays from a donor vehicle is easiest. Trying to piece it all together is a nightmare, and gets costly. I've done EFI conversions, and have it down to about 45 man hours if everything goes well. That is exclusive of the seemingly never-ending PROM tuning and data collection.

I have a donor car its a 1994 caprice I will use the wire harness and the ecm and I am using the 4l60 I dont know if i can use a 700r4. do you know if they sell any books for this swaps