Originally Posted by fast68plymouth
I like that little lip you leave at the upper/lower plenum transition.

I don’t know if it helps or not, but I like the idea of it.


Do you find that the upper or lower plane gets more flow?
More work on the more restrictive plane would be needed.

Bill

1968 Road Runner 383 727 3.91 8 3/4 3520 with driver 11.04 @ 124.26 with 1.67 60’
Done on G70-14 redlines thru factory manifolds New quickest ever 383 build in FAST.
10:1 451” replaced with 14:1 499”.