polyjohn said

As you can quite easily see, the pushrod tubes are 'non existant' on these heads.
Intake valves have been re aligned to make way for the Ovalport design.
This means that the intake rockers had to be made to compensate too.

The exhaust ports (always weak on 906 heads) were 'D ported' like the D5 hemi head, so flow would have be much better.

These were NOT designed as 'race heads' but clearly have a 'heat cross over' for passenger car use!
As the 'powers to be' were banning the Aero cars they were also going to ban the hemi in 1970/1971.
This was going to be the answer for the street-440 and the 426 race engines too.

For whatever reason they never got into production and the W2 heads were also to suffer this fate...

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