milling out the Cloverleaf in the 700-750+ HP rangesFatman wrote:Larry
With regards to the 4500 flange of the 2970, why not leave the cloverleaf shape at the face but then blend it out as you radius into the tops of the intake runners?
I thought the cloverleaf would take up some dead space in the plenum, maybe making it more suitable for a 700-750hp small block.
"definetly" makes more high RPM HP in my Tests !
in that picture the Cloverleaf material "blocks" some of
the "perimeter airflow" to each pair of runners
example->
under Carb Bore is Cylinders 1 & 3
so Cylinders 1 & 3 can easily share or get CFM flow out the
Carb Throttle Bores across from Cylinders 6 & 8
but from Cyl 5 & 7 and 2 & 4 , its partially blocked by the Cloverleaf wall
as you go around the "perimeter "
1 pair of cylinders Carb Throttle Bore Airflow
will always be partially blocked to its neighbor
as the size Engine and RPM go up , along with better Heads
moving more air,
it will respond to milling out the cloverleaf to gain CFM to all Cylinders
..this is more of a problem with a relatively small plenum
that is also relatively small in depth
..not a problem with a Tee-Pee top single 4 sheetmetal manifold
you reach a certain point where milling out the Cloverleaf
allows you to run a smaller Carb like a 1050 in place of a 1250
if you wanted to ? ..or if you already had that size Carb,
and not loose as much high RPM HP as if you ran the 1050
with the Cloverleaf
vice/versa, if the CID and RPM range is lower
and the CFM demand lower,
then you want the Cloverleaf for more signal
and a little less plenum volume effect