What year 350s out of a truck bolt right into my car? any or do i HAVE to do some mount mods? I want to find a 350 that will bolt right in...... Thanks

 

i believe that an 350 will bolt into any 305 car without modification. if im correct the 350 and the 305 are identical blocks. well it least the outside of the block is identical. 350's have larger bores and slightly different water jackets. this is why a 305 cant simply be bored out to make 350 cubic inches.

 

Mounts? No particular problem.

Any particular reason the 350 has to come from a truck?

If you look at the information available on the TBI forum, you will quickly realize that bolting a 350 in place of a 305 is not a "bolt-in". In order to run half-way decent, other things need to be changed.

But, '87-'95 350's are what you should be looking for. You'll most likely give up roller lifters if the engine comes out of a truck, but . . .

 

I'm looking for a cheap 350...... plus the truck 350s have tbi and would require no mods to run tpi or something..... i wanted to stay tbi.....

 

Check for 350 swap information on the TBI forum. What you'll learn is the TBI is a speed density system, which is sensitive to changes in flow such as occur with cam changes, displacement changes, etc.

The ECM from a truck might work in a 3rd gen, but I wouldn't swear one way or the other on that. Might be able to swap the PROM - I've heard of doing that with 350 TBI Caprice parts, but not truck, specifically.

What it comes down to is it appears you have a pie-in-the-sky assumption about this swap. Not meaning to discourage you from doing it, just trying to inject a bit of reality.

 

what would be my best way to go then? 350 TPI? How long do swaps take? i was thinking of doing it over the winter months in our garage..... Any takes on that?

 

it is a dirrected bolt in same block same holes sammmmme i did it took a 350 outof a 89 chevy pickup put rightin my car.distributer,waterpump,manifolds,accessorys,alt,powerst,airpollut,ac all bolted up works great use the 350 tbi the 305 worked but i still put 350 one on.these people never done it i have wish i had pix i changed it in a weekend.
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bull crap mine runs good matter fact i bet a stock iroc would get beat by my tbi 350 it beats mustang gts

 

I guess I need to get a better understanding of what you mean by "bolt right in" and "without modification".

You won't have to do any cutting or welding to get the engine in. To get the most out of it, you will have to replace the entire exhaust system, and tune the PROM. If that's what you mean by "modifications", then TPI is going to require the same exhaust replacement, along with dropping the tank to replace the fuel pump, which I would consider more work and modification than a 350 TBI.

It could also be argued that you can get more power out of a 350 TBI done right for less money than you could a 350 TPI.

 

well this is what i got from the change i took 305 out doin 15.7 85 put 350 in with headers and y pipe ran 14.9 93mph o and y do u need to drop tank there the same?

 

The TBI uses a different pump than a TPI. The TBI pump is also stupidly weak for even a 305.

 

the sending unit are the same and the tpi and tbi are the same i have a couple sending units 85 ir,91rs,89rsall the same from what i no but its what u say srry man

 

The pumps themself are VERY different. The TBI pump is a low pressure turbine type pump. The most it will make is 14-16 PSI dead-headed. The TPI pump is a roller vane type and makes somewhere north of 80 psi when dead headed.

 

i was talking about the way they look chill out man they look the same dont u think i no that theres more than one injector on tpi?more pressure is needed but if this guy uses tbi he wont have to change it

 

Still needs to be changed, even with a stockish TBI 350. My stock AC Delco TBI pump could not maintain 12 psi of fuel pressure on a STOCK TBI 350, plummeting to 8 psi under heavy load. The result was detonation and loss of power above 4,000 rpm.

 

i ran my 350 tbi with a stock tbi fuel pump for a week straight and it was horrible the car would hesitate to the point that you would think it was the tranny.....


put in tpi fuel pump and the difference was night and day
the car just woke up

 

I too have done a 305-350 TBI swap. The block I used though came out of a 96+ truck. I really wanted to keep it a roller cam. Not only that, but the cam is a much better unit for performance. I hope the guy that I sold the car to swapped out the heads like I told him to though. I was in a rush to get the car done, and get it done cheap, so all I did was refresh the stock 305 heads (At that point I was into the car for about $900 with the short block). I used a dual injector TBI unit with the stock intake, with 454 injectors and fuel pressure regulator (the one that was in it was torn). Biggest problem the car had was pre-detonation....but with 305 heads, that was to be expected! With premium fuel and a bottle of octane boost, it was good up to 5200 rpm. As much as I wanted to get a chip burned, I was keeping it cheap to resell it. Ended up getting $3k for it while only putting in $1800!

 

I should mention the same thing was happening with my TBI S15 Blazer. It has the same fuel pump as a TBI camaro. I put a 3.1 in place of the 2.8. I barely made it out of the driveway and back in.

 

Thanks for all the input Also, one of my friends have a 350 TBI out of a 1990 c1500. Has 50,000 and runs great is what i'm told.

 

perfect do a before and after ET'S

 

Supposedly the engine is bored .60 over....... IF it is (which i doubt) how much more hp would you get out of it and what exatly would it be? (cubic inches i'm wondering) Thanks

 

305=315or350=360

 

how much hp gain would it be? like 10 or something (if any)

 

it matters u wont see much more power but ull see more torq