Engine difference Between a 1.4 8Valve and a 1.4 8Valve SRI?

[L33]

Hey, so I had a SrI a couple of years ago and I now own a LS. On paper I know they're both a 1.4 8Valve. But obviously the SRI has about 25BHP more so whats the difference between the two and what would you need to make the LS the same enging wise as the SRI? Would it be a big job? Has anybody done this?

I have some basic knowledge so Im guessing that its something to to do with the single point Injection versus a Multipoint Injection and I think I read somewhere the valves are bigger on the SRI head?

Ta, Lee.