Quote:
Originally Posted by garyd1961
Some will say the 906 head don't flow as well as the 062 heads but don't pay that any mind it has been proven false. Are you sure they came off a c1500? The 906 heads are the HD version and came on the 2500. They should have harden valve seat inserts which is good because these heads are prone to cracks around the valve seats. The cracks don't seem to make a difference on a running motor but it's not recommended to reuse heads with the cracks. I have 906 heads on my motor and it runs great.
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They do appear to have hardened exhaust valve seats. Here is the vehicle they came out of.
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