Re: Aluminum 2bbl intake modification question
4, 6 or 8 - samo samo.
It's divided to get better idle and low speed responce,
"snap" if you will. Improves torque a bit too.
It keeps the mixture flowing faster at the lower speeds,
keeping it atomized better.
Remember, it's pulsing.
If you are only concerned with top end - grind it out -
it helps there.
Notice really high performance manifolds - high speed stuff,
use just a huge plenum chamber, log type.
When you are making 1000 HP @ 8000, who cares about idle?
But, in any case, keep it smooth, no sharp edges or rough
stuff to cause eddy currents that restrict the flow.
Match the holes to the carb base. Enlarging the holes is fine.