From my knowledge of V8's ...having bigger bore helps get the most out of the flow of a set of heads. So having bigger bore to get 2.5L is better than having bigger stroke with standard bore.

There is more room around the valves for air to move if the bore is bigger. On LS1 v8's the big bore cars make more top end hp than cars of equal capacity but using stroker cranks. They do make less torque though.

I hear what your saying about head overlap not being ideal... but at least it maximises the power I do get from the small 2L heads because the valves are less shrouded.

I will put a viewing jar next to the motor. Please place $1 in it to help with the build.

__________________
[url]http://img514.imageshack.us/img514/6284/evobeatsstiug6.gif[/url]