tunnel ram

"The problem with a vacuum secondary carb on a tunnel ram is the secondaries don't open until high RPM and sometimes they NEVER open. May as well run a single 4." When I was dynoing my tunnel ram equipped stock stroke 400B the biggest problem was the secondaries would pop open TOO soon and it would BOG badly. This is with a pair of AVS carbs, we ran out of time before completely tuning it out.