You'll definately see a great difference....and specially with ringed engines. It is true that the tolerances are much closer than they were before, but the engines still need it. You won't get it to run at full power or reliable until the ring is seated.

Magnum 4 strokers are very well known around here to take a little bit more to break in. 3 Tanks won't take much time....take your chances...do the break in, and see how it performs..for the next one then you know what to expect from first hand.

Saludos,

Jorge