i have an idea:

i'm thinking about buying a brand new 3.4 complete long block from GM

what i'm gonna do is swap over the injection system from my 3.1 and all the accessories (starter, alternator, etc.)

plus, i wanna get the heads and my plenum ported

will my idea work or will it fail???

i think it should bolt up with little or no modifications

what do you dudes think???

 

thats actually how u do the swap smog legally

------------------
1989 Firebird
2.8 v6, t5 swapped in

Ram Hi-po clutch, Cold Air, 1.6 rockers,Lakewood LCA's, Lakewood Lift bars, Wonder Bar, 3" y-pipe, Random Tech Cat, 3" I-pipe, Flowmasters, MSd 6a, MSD Coil (Fireball in future) Accel 8.8 wires, MSD Ignition Module, Auto Meter Gauges (Water, Clock (needed one) Fuel Pressure, and 5" monster tach) 4th Gen Seats


" I'd rather run last in a full out race, than to NOT run at all ".

 

Read my tips!
You ONLY want to swap intake systems.
Leave the HEADS ALONE
BESIDES THE 3.4 HEADS FLOW BETTER than anythign that can be done to the 3.1 heads.
ANYTHING
Promise
From one that just rebuilt my 2.8 MPFI heads
And that's all I did, rebuild them.
NO porting or polishing.
They are great as is!
If ya wanna port & polish your current intake, go ahead.
I don't believe you see any true gains.
It's way better to leave it as is and get the project running. Then go from there.
You will be so pleased, when you are done, no need to play with anything else, after this mission.
Besides, save yourself money and get a running 3.4 from a wrecking yard.
Save tons of money that way!
Best is to upgrade igniton & exhaust.
You'll be busy enough

------------------
Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

[This message has been edited by KED85 (edited May 07, 2001).]

 

Actually, I've heard good things from those who have ported their intake.. but if you're doing one thing, you have to do everything to see the maximum gain out of each thing. I know the 3.4 heads flow better, but I'm willing to bet they could be ported further also, and the intake at least needs gasket match porting. But once again, to see the full gains, you'll need to give the motor a bigger cam, a complete exhaust (performance cat + performance catback), and a cold air intake.. if you're gonna let it flow, you gotta let it flow everywhere.. it's only going to flow as fast as the slowest point in the system lets it. Don't build it amidst bottlenecks.

------------------
'86 Camaro SC, black /w silver racing stripes
2.8l MPFI/700r4 /w special 2nd gear delete option
In search of new v8 engine & transmission, now contemplating t5 swap to get me out of this mess.
Misc Mods: Cut air box, '83 Firebird spoiler.
Performance Parts: MSD coil, Accel 8mm wires, SplitFire plugs, Gabriel hijackers.
Audio Mods: Pioneer DEH-P3000, two 12" Optimus Pro Audio subs in hand-made enclosure each powered by a 260 watt Optimus amp. Working on shaving the box for weight.
My Homepage, with pics.

 

Here's why.
The two piece intakes do not match up correct.
The passages are off. To match them is a lot of grinding. All you are doing is pushing air. It's not compressed, it's just fed. And with over 1" square air passages (per cylinder), you are doing fine. Size of engine dictates need for the extra work, to remove imperfections. This engine, works fine, air management wise from the factory.

This is why I truly wanted to keep the 3.4 intake set up.
It's all smoothed out, every passage.

You can port & polish the 3.4 heads, sure, but, it's a total waste of effort.
To do the actual work, yourself, you would really understand, instead of being sold a phony bill of goods.
Increase exhaust efficency is the keep to more power. So is better ignition.


------------------
Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA