| Country of Origin | United States |
|---|---|
| Brand | NFS |
| Manufacturer Part Number | Bx10 |
Check the listing for details. BROWN SECONDARY OPENING SPRING HOLLEY 1850 600 750 VACUUM CARBURETOR 10 pack. Condition: New, Made in United States. Listed at 34.95 USD. We have been providing tech and working with the modular style carburetors since the early 90's. They are referred to as the brown springs. Chart shows they open at 2710 rpm and are fully open at 8750 rpm on a typical 350 SBC.
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