[HawgRyder]

Blueprinting as such for opposed type engines is not as necessary as for other types (V8..V6..etc).
I have assembled engines that were out of balance on purpose. I used very large barrels on one side and stock on the other (Volkswagon 4 cyl).
No noticable problems...engine revved to past 5000 rpm with ease...ran for seveal months in the parts getter car.
I think that the flat design helps this situation, but would not do it on a road car for reliability reasons.
It does make me think that we can get away with a lot on P-car engines though.
Bob