difference between china/new zealand EQ iron heads

That sums it up...the difference between the heads is 40cfm

The NZ EQ’s were surprisingly good....... and a real bargain.

I haven’t had a China Magnum head here to test for myself...... and to be honest, since I bought my current flow bench in 2007, I haven’t had an OE Magnum head to test either.
(Yeh...... I don’t seen much Magnum stuff)