Thread: Porting Question.

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Here's a little more about it;

A common thing that porters like to do is gasket match the heads and intake. First
for this to work it assumes that the manifold fits perfect to the heads intake face. This also
assumes that the gaskets size is right for the application. Gaskets are not designed with
airflow in mind. Remember that the majority of the port flow is on the port roof not the
port floor. Therefore removing lots of extra metal from the port floor isn’t going to do
anything other then increase port volume, which will decrease port velocity. It has also
been shown that gasket matching if not done right (i.e. proper size etc) can decrease
overall flow across the board. In a wet flow manifold (i.e. Carb or TBI) it is also actually
best to leave about a .050” step from the port floor of the intake to the port floor on the
head. The port floor on the intake should be higher. This step gives the fuel which has
puddled on the port floor a chance to re-introduce itself into the air intake stream. It acts
as a fuel shear point.

Originally Posted by camaro_fever68

Here's a little more about it;

A common thing that porters like to do is gasket match the heads and intake. First
for this to work it assumes that the manifold fits perfect to the heads intake face. This also
assumes that the gaskets size is right for the application. Gaskets are not designed with
airflow in mind. Remember that the majority of the port flow is on the port roof not the
port floor. Therefore removing lots of extra metal from the port floor isn’t going to do
anything other then increase port volume, which will decrease port velocity. It has also
been shown that gasket matching if not done right (i.e. proper size etc) can decrease
overall flow across the board. In a wet flow manifold (i.e. Carb or TBI) it is also actually
best to leave about a .050” step from the port floor of the intake to the port floor on the
head. The port floor on the intake should be higher. This step gives the fuel which has
puddled on the port floor a chance to re-introduce itself into the air intake stream. It acts
as a fuel shear point.

Makes since , the heavier "solids" will naturaly go to the bottom since they are heavy.......