it's an unbelievable amount of work. Going through it for the sake of a 10hp boost is ridiculous. I wouldn't waste my time doing it if I had a 400hp stroker on a stand, nevermind lousy 305.

In addition to the motor you'll need all of the f-body specific accessories (or at least their brackets). You'll need a radiator. Coil springs. Motor mounts (including the chassis side, which arent' likely to be the same as what the grand prix used). Tracking down a transmission crossmember won't be easy, and finding a TH350 tail shaft with the torque arm mount will be even harder. Depending on whether that TH350 is a long or short shaft style, you might not be able to get a tail shaft at all. Don't forget the custom length drive shaft. There's also a million little things like throttle cable, kickdown cable, blah blah blah. You'll need a non computer controlled carb, or keep the stock grand prix carb & computer and have fun retrofitting the wiring harness. Getting your electric speedo to work with the TH350 will be fun. It won't be cheap either. When it's all said and done, you've got a dog slow POS carbed motor backed by a 3 speed non-overdrive transmission that you spent a ton of money to install.

There's more but I can't think of it all right now. Sell your v6 and buy a different car.

 

Get a 3.8L or 4.6L V6 and swap it if he wants more power. Both those engines will easily compete with if not surpass the 305. You can find those engines pretty cheap also.

A v8 swap isn't terribly difficult if you have a donor car to get the parts you need. Even then, the little things do tend to add up cost and frustration wise. Its always easier in older models.

 

Well as others have stated, "Why in the blank would your buddy want to perform such a task?".....

But as far as your original question goes, yes it can be done. Its just not going to be straight forward or cheap.
And no the V6 radiator will not be big enough for a V8.

 

Yea , i hear ya, i think its kinda dumb, but if thats what he wants ... He said he wants the V8 sound , thinks a 6 sounds weak, so he figured a 305 is the cheapest since he could get one with a turbo350 tranny for like 300$ ... At any rate , i was chillin with him tonite told him what u guys said , and i think he is gunna sell the engine and tranny seperatly , try and get some cash, fix up his fender, and sell the car, or go with a bigger 6 , the thought come to mind of a turbo grand national engine , not sure if itd bolt in tho ? ... He basically has connections to jsut about any engine except an LT1 LS1 or old school big blocks ...

 

im also interested in swapping my 2.8 v6 with a better v6... the 4.6L swap isnt too bad and gives a good boost in power? would i need to change my 5speed too?

 

That's an even dumber idea. The 3.8 (what the hell is a 4.6???) and 4.3s are 90* blocks, just like a V8 small block. You have to make just as many changes to install one of those as you do to install a V8.

The only V6 I'd bother with is the 3.4, just because it's a DIRECT replacement for the 2.8 and 3.1.

 

the 3.4 is a straight boltup with no changes at all? But does it give any worthwhile power?

 

Ya, I mistyped. I'm sure you've never done that.

Swapping from a 60* to a 90* isn't that big of a deal. There is a far better aftermarket for the 90* over the 60*.

Ya, a 3.4 is better than a 2.8. The wife's Grand Am GT runs a 15.83 ET in full street trim stock with the 3.4L. Granted it is the 3400 series. A bit steeper gear ratio would help a lot. I don't think the 3400 series engines are a direct swap, just the older 3.4. Just a heads up on that. GM has the crate engines new or you can get a used one.

 

Putting any 90* in is a major project, especially when your parts car isn't an f-body. To go through all that work is somewhat crazy, but to do it for another v6 is just plain stupid. The procedure is 100% identical whether you're doing it with a 4.3 or a 350.

If I have to go through such an insane amount of work, it sure as hell isn't going to be for a 3.8. (unless it's a GN/TTA motor, but that's another story)

The FWD 3400 isn't a direct swap as Greed mentioned. The FWD blocks are a slightly different casting, and as far as I know, it causes problems bolting the transmission up. The RWD 3.4s are plentiful in early 4th gen cars, but with a whopping 160hp, aren't a heck of a lot better than the 3.1 that's in the car already... but it is an easy swap, unlike going to a 90*.

 

Im in the process of a v6, v8 swap... its a bitch... hundred different things i didnt think of... sell the car... sell the engine... and buy a v8, insurance isnt going to be anymore expensive as long as you dont have collision on the car, at least its that way with my state farm policy. I was payin 2800 with my 6cyl jeep and i asked my guy a bunch of what if i got this car questions, he said, basically, I could insure a viper for the same price as long as I didnt have collision on the car.