M50 vs M52 Flowbench Comparison

I put the M52 intake manifold on the flowbench today. Below are the results and the previous numbers I got from an M50 intake. All measurements were made on the 300cfm scale and at 28" of water. The unused runners were blocked off, so the numbers represent the flow from the throttle body opening to the port face.

..............M50..........M52
cyl 1.....284cfm.....188cfm
cyl 2.....276cfm.....191cfm
cyl 3.....288cfm.....201cfm
cyl 4.....288cfm.....195cfm
cyl 5.....276cfm.....194cfm
cyl 6.....284cfm.....191cfm

Click on image for larger version

Intake Plenum Comparo.jpg (53275 bytes)
M52 left and M50 right plenum size
comparison.  Notice how much larger the M50 is.
Intake Port Comparo.jpg (51466 bytes)
M52 left and M50 right port opening size comparison.  The max. dimensions for the M52 is
45mm x 23mm.  The M50 is
55mm x 25mm.