I want to swap my 305 TPI for a 350 TPI. What all can't I use from the 305 on the 350? I have heard that I need bigger injectors what about a bigger radiotor? Does the fuel pump need changed? I want that rough idle type cam so what can I do to achieve this without being restricted by the computer? I do need the computer from a 350 TPI car don't I? Any help would be appreciated.

 

Can someone please help.

 

What you "need" is nothing. Everything that makes the 305 run will let the 350 run. An adjustable fuel pressure regulator will help tune the fuel system to the 350, and you might want to go with 22 lb vs. the 305's 19 lb injectors, but you don't have to. A PROM from a 350 may also work a little better than what you have, but not likely (you don't need the whole computer).

The part about "rough idle type cam" is where you're asking for trouble. You should stick with a computer-compatible cam, and even some of them can lead to the need for PROM reprograming. That may not be all bad, but loppy cams & TPI don't play well together.

 

Some reason it posted please help again in this post at like 6:45 or something when I wasn't online so I'll edit it.

Thanks for the insight man. I was thinking about the cam before I read your post and figured not to go with it. The radiator will be fine though? Not to familiar with the PROM thing. What is it? Maybe I'll go check that part of the board to see for myself.

 

The 305TPI and 350 TPI came with the same radiator. It will be fine. PROM tuning is the art of making your own ECU chips to control how the computer responds to various conditions and hardware installed in the car.

I believe that with a lumpier cam you'll have to tune the PROM to handle that. But you can use one if you want. When they talk about buying computer freindly cams they reffer to emissions compliant cams that won't freak out the stock computer.

PROM stands for Programmable Read Only Memory. It's like a flash BIOS in personal computer. With a similar role. Just more complex.

If I missed anything someone let me know. I think that covers your last couple questions though.