Australian Falcon Member
Join Date: Jun 2001
Location: Western Australia
As far as the head differences go, the EF XR6 head has larger exhaust valves (41mm) - but the rest of the valve gear is interchangeable. The EF head has a wider edge sill - the EF cover uses a silicone seal that sort of clips into the edge of the cover (sort of like an O ring). I really don't think there's anything much different to the ED Tickford head as far as port design goes.
The EF BBM manifold is a straight bolt on to the ED head, but you need to cover a range of details such as:
1. Heater piping changeover.
2. Accelerator cable changeover (including mounting of it on the cover and slight modification of the ED pedal arm for it).
3. Rocker cover changeover.
4. Airbox and ducts changeover.
5. Oil dipstick changeover.
6. Vacuum plumbing changeover (not hard).
7. Wiring modification (minor, not hard).
8. Fuel hoses changeover.
9. Cruise control cable modification.
10. And of course the manifold itself including fuel rail and regulator.
It's probably better to look at fitting an EL BBM setup (including the rocker cover) + EF airbox + BA intake ducts.
Because the EL had dizzy ignition like the ED, it's cover should have the plug lead supports in the right places - which the EF cover doesn't. Also, if you fit the BA ducting then you won't need the support bracket and odd cover bolts that the EF cover has - so again, the EL cover setup is best bet.
As for controlling the BBM, you'll need to get a BBM solenoid (it lives in behind the windscreen washer bottle on the EF and EL - don't know about AU tho) including the connector and few inches of the wires. Good luck getting any parts places or wreckers to understand what you're talking about - perseverance is the key.
You will also then need an ELXR6 ECU - which will be a straight plugin replacement for your current ECU but you'll need to wire up the BBM solenoid and also fit a knock sensor and wire it up as well. I think the best way would actually be to get an EL ECU Loom complete - including the engine bay loom. That way altho you'll be changing over the ED loom to the BBM setup - you can strip out the wires for the BBM solenoid and Knock sensor from the EL loom and fit them to your car (ie. including the molex sockets for the ECU plug).
Hopefully that'll all give you a starting point to begin thinking about it all from :s5
IT'LL GO OR IT'LL BLOW!!!