Plenum

[Patrickttype]

Hi everyone. I have three plenums and I'd like to know which is the best and where they work best: torque or RPM? Precision? Hemco and GN1, thanks for your comments.

 

[pacecarta]

95% of users dont need more than stock,
gn1 is shiny, larger than most strong 109 builds need
pte comes cast or shiny 65 or 70mm
hemco usually looks just like stock

precision with a rjc distribution plate can help even out airflow to cylinders
hemco they cant fix .. it just dumps air to center of intake

 

[1986 Buick GX1]

Here’s some info on the Air Distribution Power Plate RJC Racing sells as they pertain to plenums.

In the beginning larger injectors were used in cylinders 5 and 6 to make up for the unbalanced airflow of the stock plenum.
As guys started to experiment with the airflow pattern of the plenums, the Hemco was born.
Then came the Power Plate, which I believe is the latest and greatest.
They’re available for the plenum of your choice.

I don’t have first hand knowledge of power band improvements with different setups so we’ll leave that to the experts.