That's a very impression collection of misinformation you've managed to gather. It's exactly why the internet is a minefield!!
Originally Posted by
Evey
Well, Basically I know the Zetec E bottom end can take about 350bhp on standard internals, and is ideal for going the forced induction route, which is very tempting
How do you know this? There isn't any truth in it at all. Some people risk running the standard rods at ~300bhp levels in turbocharged form but i've not heard of anyone running more than that (as in genuine power figures). The standard pistons are certainly not handling 350bhp for any sustained period!
Originally Posted by
Evey
But what is it like in N/A form? Can it be a N/A screamer? ie 8k rpm +?
It's fine in N/A form. If you know what you're doing 280bhp should be attainable. 8000rpm is okay, but you said 8000+, so what do you mean? 8000? 9000? 12000?
Originally Posted by
Evey
As far as Im aware, the IB5 'box will fit, but break very quickly as they can take around 150Bhp?
The IB5 can handle a lot more than that and the lifespan depends on the condition of the box and how mechanically sympathetic the driver is.
Originally Posted by
Evey
Is it just a case of Custom Engine Mount, uprated drivetrain, loom and Ecu?
If this is for a Puma you mention last, then yes some custom fabrication will be required. You're best to approach a tuner who specialises in this kind of conversions and who would know all the pitfalls etc.