Originally Posted by yollie

yesterday i breakin my new 4btt, just like usual i do my ritual to breakin this beautifull motor. but this time i tried to do it with 9886/41001 combo. i usually do it with 9901/41029 or 41030.

in the middle of breakin i swap the manifold. when i swap it the performance really noticable. 41029 out perform 41001. 41029 smoothly increasing rpm while using 41001 it feel too rich from low to high. am i doing it right or 41001/9886 need to be leaner setting than 41029/9886