Not Ranked
SteveR is pretty well right on....A valve seat like this is a simple ring that is pressed into the head so that you can run unleaded gas (a hardened seat). These seats SHOULD be a very tight interference fit, as is a cylinder sleeve. Done correctly, they should last as long as a stock head. If you have had 2 come out, I would really press Edelbrock on their warranty policy as this is a workmanship failure of some sort.
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"I think we have more machinery of government than is necessary, too many parasites living on the labor of the industrious." Thomas Jefferson
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