Small Block Head Flow Chart

This won’t be super useful anymore, since these heads are no longer available.

Nonetheless, I figured I’d post up what I had.......

I have had only one of the original NZ manufactured EQ Magnum heads in my shop.

In my mind I was thinking the ootb numbers were higher, but I guess that’s why you keep notes.

This test is with the head right ootb.......no mods/work of any kind.

However the intake valve used was a SI brand “Portflow series” piece, which has a nice smooth transition from the backside into the seat. It is also swirl polished.

The exhaust valve was a bead blasted and refaced OE valve.
No back cut on either valve.

Valve Sizes are 1.92/1.62, bore adapter is a 4.00” bore, head tested at 28” pressure, a clay radius used on the intake side, and no flow tube on the exhaust.
Tested in December of 2010.

Lift———I/E
.100— 66.6/50.4
.200—130.6/95.5
.300—192.8/135.9
.400—219.2/161.7
.500—229.4/169.5
.550—234.3/171.5
.600—236.2/171.5