ok well i got a 91 bird with a 305 tbi. I found someone in my area with a 305 tpi engine for sale. I'v never removed an engine before so i'm going to take the whole top end off the tpi and put it on my engine. Tpi set-up, heads, push rods, lifters, ect. insted of pulling the engine.
Would the stock tbi cam work with the tpi heads lifters and push rods?? whats the differences in specs from the tbi cam and tpi cam?

 

Don't know about the cam, but you'll also need the pass side both inside and outside wiring harness, and the computer in order to make the TPI work.

 

the inside harness? i thought i only needed the engine harness?

 

Since you have TBI already, keep it and get EBL flash. There is no point swapping TBI to TPI.

The TPI is not the part of the engine making power.

The TPI long block is a excellent idea, better cam and better heads, would be great if you can get the better exhaust that came with the TPI engine.

At your place I would rebuild the TPI longblock since its out, swap the whole engine wen ready and keep the TBI.

 

this is what im stuck at tho. i hear all this talk saying that theswirl ports heads on a tbi are restrecting, thats why i was going to swap out the heads aswell.
It's only going to cost me $200 for an entire 305 tpi engine. thats why i was only going to take the whole top end of it.

 

Well, its not talk.

See if you can save some by getting the long block only or heads + cam, up to you. A nice mild computer friendly Comp cams would be better then the TPI cam, every day.

Your stock TBI TB and injectors are capable of 280hp, its also pretty simple.

 

You need to swap the engine harness on 90-92 TBI cars to 90-92 TPI,TPI ecm,TPI fuel pump,definately the exhaust unless you are installing headers which i strongly recommend......

As far as cam selection,its worth it to find an Lt1 cam from an F-body for 30.00 reuse your lifters and pushrods.

TPI is far more superior to TBI no matter what you do,many have tried to make TBI perform to prove a point but in the end the TPI has much better upgrades and designs to enhance the effectiveness of 8 injectors.

My statement is not to cause a debate between TBI vs. TPI lets not fill his thread with that.....

 

In his case there is no point to swap FI.

The better fuel spray of the port injection high pressure injectors, will barely be noticeble at this stage (250-280hp) of fuel supply.

Running his stock injectors @ hig fuel pressure will be necessary and will only improve fuel/air mixture.

With EBL flash the tuning part and VRFPR upgrade will make up the whole difference between the two system's final performance.

 

Yes, you'd need the entire TPI haness inside and out. TPI uses 8 injectors instead of 2, uses a CTS for input on engine temps, uses a speed density or MAF instead of the MAP the TBI uses, probably more that I don't know off the top of my head. Thus, if wanting to swap to TPI induction, you'll have to have the entire harness, ECM, and all the wires.

Sounds to me like more trouble to unbolt the top end than it would be just to pull the whole block - less bolts to turn taking the whole engine. Of course then again, to me sounds like too much trouble to change to TPI - if I was going to go through all that with wiring harnesses, I'd swap in a LSx and be done!

 

thats alot of help which made me decide to look for a whole engine.
Strangely enough, i found a just yard thats parting a camaro. I went by to look at the engine, and it looks clean. it's an 89 iroc with a 350. i might have to brive my auto tech teacher to lend my a hand on removing it. It's going to cost me $400 without the pully system. Would my 305 pully system be a direct fit?

 

yes, it should be no problem.

You could keep the TBI system, use the 350 knock sensor and a chip from a 350 TBI truck or caprice maybe? Look through the TBI forums - I know folks have used a 350 with TBI by using the chip from a caprice or truck that had a 350 TBI stock in it. That (I would think) would end up making more power than the 305 TPI setup anyway. Especially if you did headers and used the 350 heads instead of the crappy TBI heads.

 

Yes it is identical.