Originally Posted by Jason1351
If anyone know'*, is it possible to convert a 96 LT1, out of a cop car, from TBI to TPI Plenum style? If so is it as easy as changing the manifolds?
Just out of curiosity, why would you want to?
As mentioned, the LT1 from an Vette/F-Body/Impala is 5.7L SPFI. I'm not sure if the Caprice got a different manifold (like a TBI). Police models also had smaller displacemcent (289cid vs 350cid)
You can run the LT1 as a batch-fire system with the older TPI setup. (Either MAF or Speed-Density ECM setup) While odd looking, the stock Opti-Spark distributor is still a conventional distributor. It'* just mounted on the front of the motor instead of on the rear of the manifold. The LT1 block also has motor mounting pads in the same placement as older SBC V8 motors, so you can put it in older chassis. There will be wiring changes involved (the sensor connectors are different shapes) if you choose to use the older TPI ECM.
Last: If you really wanted to, you could change the cylinder heads and run a regular manifold and distributor (you would have to plug the front cover Optispark drive hole)
If you are really considering going backwards with the LT1, Then I can make it really easy for you (I've got a 1987 5.7L truck motor out in the garage that is more in line for what you'd end up with if you backdated the LT1