This link might be of interest - you can model many 4 cylinder motors - and it's free to download.

When selecting the cam for my Chevy results seemed optimistic but gives good comparative figures.

http://www.compcams.com/Pages/409/camquest-6.aspx

Excellent, giving that a go. Thanks.

Try this link if you dont like forms

Linky

Cheers

Rich

Problem is, it doesnt have my engine on it, and it doesnt let you create one!

It keeps crashing too, something to do with measurement formula errors.