| Brand | NFS |
|---|---|
| Manufacturer Part Number | SY2 |
| Country of Origin | United States |
Check the listing for details. SHORT YELLOW SECONDARY OPENING SPRING HOLLEY 1850 600 750 VACUUM CARBURETOR PR. Condition: New, Made in United States. Listed at 13.95 USD. We have been providing tech and working with the modular style carburetors since the early 90's. They are referred to as the short yellow springs. Chart shows they open at 1620 rpm and are fully open at 5680 rpm on a typical 350 SBC.
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