Originally Posted by Brad_Haak
Originally Posted by powertrip
I get the theory, but wouldn't you want to direct flow to #7 since #5 starts pulling on the plenum first? Does David Vizard have data that corroborates this method ( I'm guessing in a SBC ) ?

The timing is that 7 starts pulling early enough that it robs from 5 before 5 is done drawing in the air-fuel charge. So ya' gotta keep as much on the 5 side and try to inhibit 7's tendency to pull from 5, too.

IIRC, he says it reduces the need to stagger-jet for that corner of the intake. Makes me wonder if something should be done for the 2/1 divider, even though they're on opposing sides of the plenum.

Brad, think about airflow in a small plenum, how hard will cylinder 7 have to suck on the plenum under the carb. to get the airflow to change directions from the # 5 intake runner to change it to go into the #7 runner: work: shruggy Maybe it is time to increase the intake lobe duration on # 7 cam lobe work

Last edited by Cab_Burge; 11/16/22 11:22 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)