Project 3400 Roller Cam Block (Page 3/82)
perry rhodan AUG 07, 12:46 PM
I'm in this same process (of putting an 3400 FWD from a G/A in my Fiero).

Since my setup will be similar to your (Fiero intake, Fiero iron head) can you give us what exactly you use and what it take from the Fiero 2.8 block and what you use from the 3400....to finally end with the final working engine?

For example I know that you put aftermarket rocker arm, but I will call them "2.8" since that for what they are made for.

Heres a partial list I've figured out for now. I'm more into my complete body/frame restoration now but I pick up any information to prepare my own swap.

Part used from the 3400:
Block
Crank
Connecting rod
Lifter
Camshaft
Oil pan
Timing chain

Parts used from the 2.8:
Throttle body/plenum/middle/lower intake
Valve cover
Distributor
Iron head (H.O.) (complete whith rocker/spring/valves)
Water pump
Timing cover
Drive pulley
Timing/damper pulley


Part coming from other source:
Pushrod (custom correct lenght...Smith Brothers?)
Piston
Flywheel (from an '88 Fiero or Z34 or any zero balanced that fit)
Mustang or other compatible #19 injectors

Do I miss something? In the "other source" department can you help us in from wich "donnor" we can use them or from wich source?

Which piston did you used? Anything else special to mention when building the engine? other parts, special preparation?

I've read the Fierosound web site, but nothing better than a live discussion and fresh memory of the same engine building

Many many thanks!

[This message has been edited by perry rhodan (edited 08-07-2006).]

lou_dias AUG 07, 06:55 PM
I used the Federal Mogul TDC pistons listed on Fierosound's site, re-used the rods and crank from the 3400.

The diameter of the pushrods can be stock, don't pay for the extra weight and thickness of the 3/8" he received (but didn't ask for).
The timing mark on the 3400 wheel is set up the same as the 2.8 so no need to modify that.

As for the rocker conversion, I chose to go for FULL roller rockers. The Fiero Store sells a kit that comes with the rocker stud adapters and Crane 1.6 full roller w/narrow body. You must get NARROW BODY rockers. If you can find FULL ROLLER NARROW BODY rockers in a ratio higher than 1.6, please let me know. These are for 3.8 Vortec motors. I'm amazed I couldn't find higher ratios that were full roller... I ordered Summit rockers, p/n SUM-G6936-16 is cheaper than 12 individual ones.

I ordered the stud adapters from Jegs, it's a Crane p/n 99148-2, comes in sets of 2 for around $24. So you need 6 sets. The end that goes into the head is 10mm diameter, the end that the rocker mounts to is 3/8" diameter. You could stick with roller tip rockers, but I wanted FULL ROLLER...

Everything else, I did via Fierosound's page.
perry rhodan AUG 08, 07:35 PM
Does your 3400 pulley look like the 2.8 one?

Can you send us a closer pic of it, and from the front?

Thats because my 3400 come from a G/A 1993, and the pulley didnt look like the 2.8 one.

[This message has been edited by perry rhodan (edited 08-08-2006).]

AutoTech AUG 08, 10:49 PM
Head gaskets - 3.4 is .040", 3400 is .060". Which do you use?
lou_dias AUG 08, 10:58 PM
I used a 2003 Monte Carlo 3400. When the machine shop put it on, it was at TDC at cylinder #1 with both valves closed.
I told him to use to F-body 3.4 head gasket.
lou_dias AUG 08, 11:00 PM
The motor's in the car. The mechanic's just being an arse hole about spending the last hour on it bolting down the intake and setting the timing.
AutoTech AUG 08, 11:07 PM
I have heard that the piston will kiss the head if 3.4 gaskets are used. Do you know anything about this myth?
lou_dias AUG 09, 06:43 AM
I don't see why, they are domed. Higher in the center than the edges. I've never heard that before. We'll find out for sure soon enough.
Lilchief AUG 09, 05:55 PM
lou: On my 3.4 I got 9.8 cr with 6 cc dish pistons or -6 dome. With a flat top piston you'll have somewhere around 10.7 cr

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85 GT 3.4
Auto 3.08
14.9 @ 90 1.9 60"

AutoTech AUG 09, 08:00 PM
I did the calculations to find out the C/R with stock 3400 internals and iron heads using the calculator from this website. I came up with around 7.3:1. Does this sound right?