Carter afb differences
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Safety Car
Joined: Apr 2009
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From: Georgetown TX
2025 C2 of the Year ('64-'66) Finalist - Unmodified
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Carter afb differences
What is the difference between Carter 3721 AFB's with the "S", SA, & SB?
Race Director
Joined: May 2000
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Differences in jets and rods since the 3721S was only used on the 327/300, so it was leaned out since the prior 3461S had to work for both 300 and 340 HP engines.
Subsequent releases richened it up slightly including bigger (.037") idle jets that are built into the primary venturi clusters compared to .035" on previous versions including the 3461S.
Duke
Subsequent releases richened it up slightly including bigger (.037") idle jets that are built into the primary venturi clusters compared to .035" on previous versions including the 3461S.
Duke
