New Magnum heads for 347 with Flow data

RAMM said
Considering how the port is acting and has acted all along-there is only 1 or 2 things to look at. The pinch or the S.S. I know the S.S. is tall and nice and I also know that laying it down or shortening it can unlock some flow. Usually though you trade low lift flow for high when dealing with the S.S. I went in and used a smooth carbide to just lay it back .020-.030" and finished it with a sand roll. It flowed quite a bit better and the stalling point moved up to exactly .435". I will wait until I have the manifold on it to do any further testing. A manifold will usually calm things down which allows the flow to hang on better. J.Rob

.1 64
.2 128
.3 191.5
.4 228.5 *233 @ .435"
.45 224
.5 219
.6 219

p.s. Make no mistake-I have quite a few hours in these heads and would have to charge a decent buck to do this. However I would move to a set of EQ's and never look back.

its true that the intake will slow it down, but it will kill the flow quiet a bit as well. Ive tested heads at 298cfm and after putting a victor on ...they flowed 265-270's cfm. before working the manifold it can eat up 30 something cfm.
The rpm and ld340 intake for instance only flowed in the 220'scfm per runner as cast.
You may find yourself in that case with only about 215-220cfm after the intake gos on.

How about skipping on the sand rolls and leaving the port rough, and if you attack the short turn more...make it longer, lay it back from the half way point just a lil past the floors as cast peak. Also sometimes a basic 3 angle is all you need, in other words too many angles can work against you in the fps depot.