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NOS GM Diaphragms for Holley Carbs - $40 (Springfield)
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Used on 1967 - 1969 HD 427. Price is for each.
NOS Diaphragm, Carburetor Throttle, Holley carburetor. GM PN 3852474 (Gr. No. 3.758). Have 2. DISCONTINUED.
See LAST photo for specific applications. Price is for each.
Parts in original GM boxes. Never installed or used. Boxes only opened to take attached photos. Kept in a larger box and stored inside.
If you have an original Holley carburetor for the above years, the diaphragm is possibly in poor condition from dry rot or torn from cover removal. Carburetors were zinc - no plastic used in the time frame of these applications.
Note: Above Diaphragms used on many other GM engine applications. Must research for your exact needs.
Price negotiable if can find same GM NOS parts in original boxes cheaper.
I also have GM NOS springs for various Holley vacuum secondary applications. Can send photos to your smart phone if requested.