Its weight @ 15.8 lbs would suggest its a bit light for alloy as most single 4bbl intakes for FE have shipping weights ~26lb. However most common alloy intakes today tend to be quite thickwall by nature to allow room to port match etc.
This piece looks like it has been cast in factory cast iron type molds, but its missing the exhaust passage by the looks of pics. Does mag have the same shrinkage factors as alloy, eg could it be cast in iron size patterns?
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Jac Mac
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