Hello. I have a 350 tbi engine out of a 95 chevy silverado. It looks like it should mount right up but I was wondering for any advice about anything I might need to swap over also. I have the silverado so I can take any parts I need to from it. The car the engine is going into is a 89 Firebird Formula that had a 305 tbi until heads cracked. Thank you in advance.

 

Direct drop in, need to have a 350 chip tho. The 95 pcm isn't the same unless you swap the harness and pcm. Other slight differences

 

I figured he has the whole motor. Lol

 

Yeh, I have everything. Just didn't know if factory computer would hook up

 

No. Some guys were swapping the pcms into our cars in the past but I've been out of the TBI game awhile

 

So I swapped the engine out with the 350. I used the 305 harness and pcm. Then I used everything connected to the engine (intake, sensors) and put it in. The only thing I found is that I used the 305 tranny and it didn't take the extra power. And I found that the Alternator mount actually sat higher relative to the engine so if I stepped on it hard, the Alternator would vibrate against the hood. Since the tranny went, I went forward and bought a parts car to throw a t5 transmission into it. Now I can spin tires up through the first 3 gears. During a dry day!!! Very excited. Should anyone have any questions after I post this reply, feel free to pm me. Thanks everyone who helped and sent me a reply.

 

the swap should be easy, they are the same block and tranny. The o2 sensor should still operate the same, the injectors should work fine too. They are all 12 volt activated by a grounding signal. I do however recommend upgrading the exaust

 

So why do you need to swap spark control module if you get a custom chip?

 

a chip will change your timing, advances it, which makes the engine run a bit warmer so they tell you to put in a cooler thermostat. You can also advance the timing with the engine not running, it will stay advanced. Your car shuts down at 110 mph, it's not recommended, but you can run a switched wire to the fuel pump relay, it won't shut down at 110. So what is your question about the chip?

 

Not sure if your replying to my post but non of this makes sense

 

Come on now, the 305 tranny couldn't take the power???

 

That must be a hellofa truck engine!!!

 

I'm swapping a 88 305 TBI out for 88-89 350 TBI in an 88 IROC. So ECM is to be changed or can u get 305 upgraded? (chipped). What else to make this transition easy. I've read knock sensor. Any help would be appreciated.

 

Sorry, you probably got all your info but figured I'd reply. Ive read you can change the ecm or get it chipped but I'm running a good a/f ratio with my stock ecm. As long as you make sure to use the intake from the 350 so it has the bigger tbi and injectors.

 

Solid motor mounts- or a chain to the frame on the driver side to hold it from moving! Poly mounts might keep it from hitting too.