Originally Posted by
rmdhawaii
O.S. Speed .12TZ Spec II: Anybody else run this engine? How has break-in been? Is it still too tight like version one or is it better?
I broke my spec I. and spec II. with wot methode. I think this is the the best methode for OZ engines. but be carefull with the conrod. If you run competition you have to change your conrod every galon. this engine is tight and thatswhy it has to much stress on the conrods. You now the conrods from OS speed's are same as the OS TZ ! And I thing this is wrong. this engines need a new stronger conrod because of the high rpm.