07-09-2003, 10:38 PM
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CC Member
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Join Date: Jan 2003
Location: Aurora, OR,
Posts: 36
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Not Ranked
The machine shop that built my 351W (now 408) machined my Ford "Cobra" valve covers to clear the roller rocker arms. They also used a double thick valve cover gasket to add a little more height to the finished product. As John says, the machining is to clear roller rockers.
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