Originally Posted by saph in dorset

I certainaly wouldnt reccomend the people in that link.

You can fairly easily get 350bhp out of them and then with a rebuild for forged pistons retc 450/500.
To get this you do need to turbo the engine either single turbo, twin turbo supercharged. All are effective depending on what you want.

Alternatively if you want to stay na you can get around 230ish by changing injectors vauxhall v6 ones, changing cams to bob cams, i have changed my management to ensure fuelling is correct which transformed the car from the standard ecu. You can also change the plenum chamber to give better flow. Lots you can do depending how far you want to go.

Have a look on http://www.fordpower.org.uk/index.php there is lots and lots of information on there.