Preparation for heads, uim, camshaft and downpipe

[whitelightnin04MC]

There is no reason to pull the motor just to swap the top end.

I don't know a whole lot about it, but after the header install, it just seemed to me that swapping heads would be a WHOLE lot easier with the motor out.

[onefastV6]

I don't know a whole lot about it, but after the header install, it just seemed to me that swapping heads would be a WHOLE lot easier with the motor out.

I have swapped heads 3 times with the engine still in the car.....pulling the engine to do heads is going to take twice as long and be twice as hard in my oppinion.

The best thing that I found to do is to install the exhaust manifolds on the heads before you bolt them to the block.

[Superdave]

I don't know a whole lot about it, but after the header install, it just seemed to me that swapping heads would be a WHOLE lot easier with the motor out.

with air tools i had the whole top end of my old 2.8 off in under 30 minutes...


It's very simple to do in the car...

[whitelightnin04MC]

Good to know.

[IsaacHayes]

The 3500 plenum will need clearancing for the FPR. Using a 3400 UIM will bolt right up without much problems. You gotta re-use your 3400 fuel rail and injectors. The 3500 plenum also needs the evap port tapped and T'ed off for vacuum for the FPR and transmission. And you gotta re-wire for the new MAP or use the old with some vacuum tube. And you need a TB adapter. If you don't have all that stuff ready to go, just find a large port 3x00 UIM so you can get out of his shop quicker and put the 3500 on later once you get all the stuff for it.

[skinrock]

So, I should buy the ported 3400 UIM on this store if I get the 65 mm TB, and everything will fit right?

[SappySE107]

You would need the option for porting the TB part of the plenum to match a 3400 for the 65mm TB.

[ForcedFirebird]

You would need the option for porting the TB part of the plenum to match a 3400 for the 65mm TB.

How big can the 3500 plenum be ported? Actually, the 3400 as well?

[skinrock]

Quick question, I didn't even think about this. I just ordered a 200 amp alt for my 3400...does the stock alt still fit on the 3500 top end swap (stock UIM). In other words, if I ordered the alt for a 3400, is it going to fit when I swap for 3500 heads and lim?

[SappySE107]

Yeah, that shouldn't change at all for the alt. The 3400 can't go much bigger than 65 and the 3500 can go 70 at least. I don't know what the max is, but 75 might work too.

[IsaacHayes]

I would use the 3500 plenum too for the added power, but if you cant swap it on at this time due to getting it running and out the door, you can just use a stock 3400 plenum and then go back the next weekend and get the 3500 one working. The 3500 is too nice of a peice not to use.

The 3500 opening stock is 65-66mm.
The 3400 can be opened to 65mm but not much past that.

Your alt will be fine.

[skinrock]

Thanks for the help guys. I just paid for 3500 heads and lim. I decided it's a doable job, and I think I will really like the performance increase, especially since I'm officially doing the ZZP downpipe as well.

[gectek]

ur not gonna need a vacuum T off the intake to run to the trans unless u run the older 4t60 trans, but if it is a 99+ GA then u dont have to worry about that

[IsaacHayes]

I keep forgetting newer 4T60-E's are fully electronic. In that case just run a vac line to the FPR. A lot simpler and cleaner. Lucky you.

[whitelightnin04MC]

Or, in skinrock's case, the 4t65.