George,
Would you clear it with Joe?
You may know that Motor Castings pours all the blocks used in NASCAR Cup & Busch. They also pour a bunch of performance heads in iron and I'll be damned if I know where all of them go.
Are you sure that they are only made of Class 30 gray iron? Motor Castings does alot of higher tensile irons. The raw castings do not look like class 30 iron. Let me know want information you need.
John
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