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Von, be very careful on buying a used set of ported 906 to M.W. intake port size. It is very easy to mess those heads up trying to make them better,(to many valve jobs, cut in the wrong places and so on ) if you really want them take them to a reputable machine shop with a good flow bench and have them tested, post the results on here before buying them to see what the knowleagable head guys on here think of those flow #s first before buying for the heads

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Good advice Cab. I wouldnt buy a set of used heads without reputable flow numbers.

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Cab , has some good advice Id stay away from those heads unless they were really cheap. Even then, Id be afraid of those heads. As in maybe cracking and hydraulicing your motor.

Imo opening up a 906 head to MW size wont make it Flow any better numbers. But that doesnt mean it wont make the car run any faster as it will have extra port volume.

The choker on the 906 port isnt the opening its the inner throat and short turn. That will dictate the max airflow not the size of the port opening. Whether it be OE or MW size.

Also when porting a old OE head the metal fatigues rather quickly with the beating of the grinder burr. The more you grind/port over the same area the more Fragile/fatigued it becomes.

If you want to see how fragile these OE steel cast heads are. Take a Small ballpeen hammer and start swinging away.

You can bust these cast steel heads to bits, no problem. A over ported port will not only be thin but also serverly fatigued IMO mike

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