Okay, I am going to attempt the 3.4 swap into an 85 2.8 bird (will reuse the 2.8 intake setup, I don't want to have to mess with changing the computer and harness , etc.) basically I want to know dose this cam look like it would be a good match up? I want strong TQ from idle to about 5500RPM and decent mid-high horse power up to 5500RPM (how often do you think I'd ever need to go over 5500? this is just going to be a daily driver, with some pep )

Also, being that I have a 85 bird with a stock 2.8 (it locked up and I just junked it minus intake and harness) I've got a 3.42 rear end open diff, would It serve me better to go with a 3.23 rear from a V8 equipped car? ( I want to convert to rear disks as well as get a posi diff.)

Also I've originally was going to replace the 2.8 with a 355SBC but I've decided to be kinda different and go with a 3.4 to save on gas and surprise some people.

What would it be like if I de-stroked to 3.00” ?

Would It be easier to use a 3.1L engine (I've read about the 3.4 and that plug that is really hard to get out...)
going to use stock valve size (what would be a safe over sizing of the valves on those heads?)
Engine: 3.4L
Comp Ratio: 9.0-1
Heads: 3.4L FWD
Bore: 3.620 in
Stroke: 3.310 in
Cam: LCA: 112
ICL: 110
Intake Duration : .215
Exhaust Duration: .215
Intake Lift @ valve: .420
Exhaust Lift @ valve: .420
Headers: Pacesetter
Mufflers: 2.5inch single from headers to the muffler thats on the car, it has no identifying marks, but I like its sound, nice muffled rumble.
Intake: 2.8L MPFI

I know my formatting is going to get messed up......


thanks in advance.

 

these engines dont make power till in the revs so a lower ratio gear will kill its performance, if your that worried about that plug just swap the heads from your 2.8 or any other 85?+ RWD 60*V6 they are all the same.

you will also need the injectors from the 3.4 donor car to get the F/A ratio right without tuning the ECU.

 

My old GM V6 performance manual said that stock the 3.1 3rd gen engine from 90-92 had the best stock heads, cam and intake for stock class racing, whether you were running mpfi in the cars or tbi in the s-trucks. It also said to run that setup as a sleeper mod on factory carbed 2.8s...

Your list says FWD heads... isn't that a whole nother ball of wax?

If you're looking for advice; 3.4 short block, 88-92 2.8/3.1 cam, intake and heads, change your rear end to a DEEPER gear set, like 3.50-3.73 range.

Heck, that's why you've got overdrive anyway, right?

Good luck!!

 

the v6 loves gear,4:10s on an na motor,and 3:42-3:73 for a forced induction motor. i dont understand why everyone wants to destroke these engines,u do that u pretty much have a 2.8 bored out to 3.0L,for one most of u guys will never rev the motor above 6,300 rpms,in order to make power that high u need a massive cam,none of which will work with the stock ecm tunning.are u going to swap to dis?u cant use a distributor with the fwd heads,unles su make a custom manifold. set of 1.6 rockers would make a great diff with that cam.though u could also use a set of 1.8 roller rockers from an sbc,except there kinda costly,and requier machine work to the heads.

 

okay, so revised list:

3.4L block
3.4L injectors
3.1 heads form 90-92
and just put an after market posi type unit in the rear (I think I wanna stay with my 3.42 gearing, I may go turbo before its all said and done.)

I know desktop dyno isnt to be trusted much for acuaracy on power out put, but it would be a good way to see where an engine would start building power, which shows at 2500 to 3000 RPM is where it starts to make decent TQ and 3500 + RPM is when it starts making good HP (as was said, upper RPM range) but I want good low end TQ as well.)

Unless any one knows where to get a set of turbo headers for a this application, in which case I would use a completely different cam shaft. not sure on what kinda turbo would be good,

in NA form i'm not looking for all out performance, mainly just quick get around town type stuff. If I go turbo I want at least 250HP at the crank. probably just go NA to save time and money (and I've never done any thing with forced induction and I dont have time or money to mess with it right now.)

 

You can use heads from the 2.8/3.1/3.4 from basically 87-94 I believe. Use an intake from the 86-92 mpfi V6 and the 3.4 injectors. Use a stock cam from your 3.4 or 90-92 3.1 and you should be set.

There are lots of guys who use turbos here on their 60 degree V6 engines. Some use wrecking yard turbos and some use custom aftermarket stuff. That's a choice for afterward, though. I think you should put your engine together and in first and then start on the next step. You've gotta locate your computer (7747?) and then start getting the turbo stuff all into one milk crate so that you have everything when it starts.

Oh, yeah, you need a V6 transmission housing so that you can shell out the guts of your V8 tranny and rebuild it to fit your 6.

Good luck!

 

u dont need anykind of headers for the turbo,for mine i modified the stock y pipe to come under the front kmember upinfront of the engine,
for a real basic turbo setup u can get a turbo off a ford turbo coupe,and some other cars in the junkyard,on a stock 3.1 5-7 psi will get u about 255rwhp or more depending on what turbo and the effeciancy of the intercooler.a 3.4 will be more powerfull.
as far as an na cam there isnt a whole lot to chose from its either gonna be really good low end with a sacrifice to top end or the other way around

 

I already have a V6 trans (my car was orginaly an 85 2.8L V6 I never got around to buying a V8 spec trans.) I may just go strait for a turbo if I dont need custom headers.. as far as my computer its whatever a stock 85 base model bird would be.

 

here this isnt finished,but it will give u some ideas to work from,and an idea of what things will cost
https://www.thirdgen.org/forums/v6/3...ing-turbo.html

 

the heads from 85 to 95 are all the same 2.8/3.1/3.4.

 

Get a HT 3.4 long block assembly and be satisfied. You can get it at sdpc 2000.com