Holley Base Plate Number for List 4491 Carb
 

I have a 1970 L-78 Nova (California car) and I am searching for the correct base plate number or complete carb. Any information would be helpful. Thanks in advance.

12R-4594A is the throttle body and shaft assembly, according to Holley Illustrated Parts & Specs Manual dated 1975.

Holley may have changed their numbering system since then, but at least this should give you a place to start.

Thanks for the reply.

1970 California NA9 Holley Carb bases are embossed with Holley part number 12R 4506 and have extra vacuum port tube on front pass side of base.


Need to pull off front bowl to see the part number on the front of the base.



Fed carbs are embossed12R 4506B on front of the base.



Copperl654spd

Thanks for the updated information. Happy I have the correct base for the NA9 carb.