I currently have a 1.4 zetec se engine in my ford focus
I never looked after the engine and it ran out of oil and still drove it. In result i have now been told by my mechanic a new engine is required!

I was wondering what is the biggest size i could put into my car without to much fucking around and hastle.

Was looking at putting in a 1.7 puma zetec se engine in but i dont know if this is as easy as slot in?

Any advice on whats easiest and best?