Can i bolt in a 3400 v6 with the gen 3 heads, and intake and use my stock wiring to run it? also how much power do you think it will make with a gmpp cam, headers, no cats, 3 inch exhaust, and a good cnc port job on the intake and heads? you think 250 hp at the crank is attainable? but mainly wanna kow if i could use my current harness hich is for a 86 2.8... Thanks

No, your wiring harness won't directly connect. Good luck mounting the engine; that's a FWD engine. You'll need quite a bit more than just bolt in and go.

You'll have to make a custom motor mount, the oil pan hits the k member and the starter is on the wrong side. There are a few other minor issues but if you can take care of these you're in good shape.

well iwas only talkng aout the top end (heads, intake), i am gonna get a 3.4L from a camaro or firebird...i am pretty sure that would be a direct fit...and i guess i will have to get the wires out of it with he computer...
but you think the power i would like is achievable? or somwhere near it?

I would have to agree with FF...There are a lot of little issues that need to be addressed when doing this. It is no where near a drop in and go thing. Although with your MAF system, it might be easier to tune the fuel, than my MAP system.
Although you will need to figure out the spark (dizzy) issue. You will need to run coil packs. If you use a 3.4 you will already have the spot for the crank sensor, but you will need to wire it in and adjust the timing (I think it is advanced past stock). You will also need to drill another hole for a coolant temp sensor. And you will need to figure out a way to route the TB cable...should be easier, since you have a 5 speed.
Headers would have to be altered or custom. And I would like to add that a 3 inch exhaust would be a bit overkill for these engines...2.5 inch would be good. but that is debated a lot here. IMO 2.5 inch is a good size for these engines.
These, among other issues. Depending on what CR you are running and other factors, 250 at the crank is possible with a good setup.

what is the spark (dizzy) issue? and i read that all RWD 60 degree blocks have spots on both sides for he starter, and that FWD parts are all interchangeable with RWD 60* parts, minus the block...does the intake not have a place for a distributor? i am looking for something simple and quick...how much would power would you guess it will make if i stroked my 2.8 to a 3.1 and had the gen III top end with a bigger cam, with the headers exhaust, etc.?

this has been discussed time and time again. theres probably at least 2 or 3 other posts on the 3.4/3400 hybrid swap on this page alone.

maybe there will be a sticky explaining the hybrid swap in detail for everyone to see.

Here is a good link to a great thread... LINK (The arguement for Aluminum Heads on the 3.4)

A thread with that much good info should be a sticky.

The intake covers the hole for the dizzy. You will need to use the oil pump plug from the 3.4 to cover the dizzy hole. So getting rid of the distributer you will need to swap to the DIS ignition that uses coil packs.

How much engine knowledge do you have? And how "quick" do you want this to be done?

i have enough, i can do it, i just do not want it to be a pain in the ***, a direct fit is what i am looking for...that is why i ask...if it will fit directly without changing anything lke mounts, wires and such...i am just looking for a temprary boost in power until i save for something better...will the heads be a direct bolt on?
just someting quick is what i need...

I am planning a 3.4 swap myself and I am finding out that the old hot rod saying "Fast:Cheap:Good: pick two!" applies to engine swaps particularly!

well...cheap and good would be what i would pick...i am not trying to make my v6 fast as lightning...i just want to get a little more kick out of it till i get a better engine...i am planning something crazy.. probably an inline 6 like the new atlas 4.2L engine... so i want someting decent until i can do something better...

I vote for a sticky also!!!! Im sure there will eventually be one, but since im doing the swap soon it would be awesome to have

do you think it would be a waste to just swap in the heads and use a bigger cam and port the intake, and match it to the heads which will also be ported... that would work right? my engine needs a rebuid anyways so i figure do it all at once...will it raise or lower my vompresion if i used the gen III heads?

Just swaping the heads/manifold alone is worth ~40hp over stock. A good cam, porting and gasket matching should bring you close to your power goal. You'll also need to get some headers and slot the blot holes to fit, the stock manifolds won't work. Using 3400 heads with 3.4 pistons will give you 12.9:1 cr (w/ .06" head gaskets), obviously unusable with pump gas. Using large dish pistons from a '99 alero (other cars have it) will give you 9.8:1 cr w/ .06" head gaskets.

how would i fit the 3.4L pistons into a 2.8 block? isnt the bore .1something bigger? how much would the compression be with a .02 over 2.8L piston? and if i just use the heads and intake would i still need to use the different wiring harness and ecu? and i thought i could just get the headers that they have at summitracing.com i thik they are heddman headers and use them with the heads...

You had said earlier that you were getting a 3.4 block. If you use the 3.4 block you need pistons from a FWD 3.4. If you use your 2.8 you will need to get pistons from a FWD 3100...Or you could go custom...

...But if this is only a temporary thing until you can drop in something else, you probably dont want to spend the money on those. Although this whole process gets kinda expensive, so I dont really understand doing it as a temporary engine...
Also, depending on how many miles are on your car, it might be a good idea to get your engine honed...and if you get your engine honed, you will need to buy oversized pistons. <--just something else you might need to consider.

I would recommend reading that link I gave you. It explains all this. Im not 100% on the 2.8 wiring, but all the sensors should be able to be spliced in. You will have to drill a hole somewhere for a temp sensor...FWD motor only uses 1, your engine uses 2.

Pasesetter? Im not sure if the primaries are big enough for the 3x00 heads. But if they are you will need to make the bolt holes further apart...

Those are my headers, modified by FF.

You mean bored. Honed is just cleaning it up. Bored is taking off enough metal that it resizes the cylinder. Just a hone will still us the stock size.

Good catch. Just making sure everyone is awake

You can use the single boss in the block for you temp sensors instead of drilling/tapping etc. GM has a 3 wire sensor for the block, use this in place of the two wire and you'll have a lead for the guage and a lead for the ECM

well you see... i can get a 3.4L from a firebird/camaro for 300 bucks, with low miles...i thought that that particular 3.4L would be a direct bolt in since it is a RWD block...(easy, straight forward, at lest i thought)... and then i was gonna get the heads from the 3400, since they make more power, i read about this guy who did it to his 95 camaro and got 220 something to the wheels... so since it would require a lot of drilling, DIS, and such i will probably just get the heads, and port the current intke on my engine, with a bigger cam and exhaust... i dont have any idea how much it would make, but it will definately be stronger than what it is now...

The block is a direct bolt in. The FWD heads are not. They require work.

so could i just get the RWD 3.4L, put the gen III FWD heads, get the proper pistons, work the exhaust to mek it bolt on, and use the intake from the 3.4L RWD and port it out to match?

You have to use the manifolds to match, the entire 3x00 (Gen3) top end has to be used.

This should explain a lot http://www.thirdgen.org/techboard/v6...ts-hybrid.html (What's a Hybrid?)

will the Gen 2 heads be a direct bolt on with my current intake? I can port them and port the intake as well...would the heads require a gen 2 intake or any special work?

well? would they be a direct bolt on? or would i need different pistons, or a gen 2 intake? or anything special?

no, it would be no different than going to the 3x00 heads you will have to change your intake and pistons if you don't want high compression. Try to get 3400 or 3500 heads if your going to go to the fwd heads.

You know what I would recommend you do?
Since you want an easy drop in project, you should just buy a set of iron heads (same heads that are on your engine), get them ported and polished, gasket match the intakes, put on headers, swap in a new cam, and call it a day.

It dosent seem like you are quite grasping the concept of the Gen 2 & 3 top end swaps (no offense...it took me a while to grasp it as well. Just search around, and do more research.) Read the 2 links that were given and search around at this site as well --> 60DegreeV6 There is a lot of great info on the Gen 2/3 swaps...you just have to search for it.

You had mentioned something about a guy dropping it in a 95 3.4...With the 95 F-Body, the ECM already uses the DIS ignition...so it is much easier to do it in a 4th gen F-Body. But in the 3rd Gen F-Body it is not anywhere a drop in and go swap.

well can i take a 3.4L from a camaro and use the heads and intake from my car? or will i need the heads and intake from that one too? it is off of a 1994 Camaro...that one is 160 hp right?

Exact same heads. Use whichever set is in the best of shape.

which would be the correct pistons for stock or a little higher compression?

http://store.summitracing.com/egnsea...=KeywordSearch

the dish with no reliefs? or the dome with four reliefs?
and can the iron heads be ported to use the larger valves that are on the Gen 3 heads?

The dohc pistons (domed) will give you about 10:1 cr. The heads can be machined for larger valves, consider having them backcut as well.