Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Will these mounts clear stock SBC clamshell's?
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Old 05-22-2013, 01:15 PM
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The frame mount you have pictured is for use with the stock 1975-up block mounted steel "clamshell" mount . It replaces the stock encapsulated rubber mount on the frame of 1975-up GM cars and trucks, making a solid connection.

It won't work with earlier pre-1974 mounts which have the rubber part on the engine, as shown in the second post above. The width will be incorrect.
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