Flow testing a M20 head

[bobmartin]

has anyone flow tested stock or modified M20 heads? I'd be interested in flow figures

[jlevie]

Talk to the folks at Metric Mechanic

[nando]

lots of people have. stock ports seem to flow about 180cfm, ported anywhere from 190-200cfm.

the exhaust ports are about 75% of the flow of the intake ports, but the dynamics of an exhaust port are vastly different.

[bobmartin]

lots of people have. stock ports seem to flow about 180cfm, ported anywhere from 190-200cfm.

the exhaust ports are about 75% of the flow of the intake ports, but the dynamics of an exhaust port are vastly different.

Thanks. Thought it'd been done. It seems to be at 28" of water. Found a head flow trhead on E30tech

[deutschman]

read all of this! i did, and it helped.

http://www.e30tech.com/forum/showthread.php?t=75938

[morerevsm3]

this head was done to suit class rules that dictate stock 325i camshaft