Genuine Holley Vacuum Secondary Diaphragm Housings and Covers are designed to replace your existing cover without any modifications.
They are made of die cast aluminium and are chrome plated for durability.
Sold individually, discontinued by Holley making these rare and hard to find.
Holley Part No. 34-503
If carburetor is equipped with a black plastic cover then you must also purchase a special choke cable clamp kit, Holley Part No. 45-456, if you wish to retain hand choke cable operation
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