Join Date: Jan 2004
Location: Spokane, Wa
My Ride: 85 GLHT, 87 ShelbyZ,
Engine: 2.2 T2 and 2.5 T2
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Keep your current head if it's good. The 2.5 head has cross-drilled cooling passages. Just bolt the manifolds onto your current setup/motor. Since it's an auto you can pull the whole motor and leave the tranny in the car easily. I'd convert your current turbo to turbo 2 specs by getting T2 housings for it. It will flow better and with exhaust mods will spool just as quickly as the one that's on the 2.5 head.
Vacuum line will need to be redone, easy to do. Use your wiring harness one the 2.5 injectors.
For the computer you have a couple options. Upgrade to 1987 T2 electronics and have someone (vendor/or someone that can tune the computer code) make you a Logic module that will run it. Or keep an eye out at the J-yard for a 1988 Turbo New yorker, Grab it's wiring harness from the firewall to the front of the car and plug it into your firewall connector. Then you'll need a PCM from an 1989 2.5 T1 car. Add the i/c and you're good to go.