I just had my new 416 built this summer by Nick Wilson (RIP) and I am still putting on the 500 mile break in on it with the Brad Penn SAE 30 break in oil. I dont believe we discussed what oil I would run after the break in period. If I remember he didnt want a synthetic right away. I already changed it once along with the filter after the 2 initial 20min break in sessions per Nick. So what would you guys recommend, a good 30W or 20W50. It sees mostly street duty with a few times at the track. Thanks for any input. Greg

416 stroker from Nick at Compu-flow. 11.14 in full street trim. Seems like a new best every time out.
11.06 open headers----so far!!