ORIGINAL: SKYLINE350GT
I ran the RB 063 and RB 086 with and w/o waller and long header. I found that with the 063 it got horrible run times and tons of bottom end power. Too much. I run the RB 086 on it now, toned down the bottom end a notch, but still has plenty and the top end came to life.
The 421B is one of my favorite motors. I run it with the AB 053 pipe, and it has Similar bottom end grunt ot the P5, but with tons more Top End pulling power. Likes to run a little hot though. But dont mind it. After a gallon or so through it the temps should drop.
Good info, thanks. A lot of the locals run the 086 (and 9886) so i'll try one of theirs. Do you run the 086 with or without the Waller? I'm guessing without?
My P5 runs a little hot too so far but i'm sure it will start dropping now that there's almost a gallon through it.