Reply to "Mechanical vs Vacuum Secondaries"

KR500Member

You might consider a Holley 4609 Ford Autolite #C9AF-9510-U (735 CFM) which was developed by Motorcraft and Holley as a Ford over the counter performance carb for refitting on 428 CJ engines. This was specially designed to provide excellent low rpm signal with skirted main venturi boosters and special down leg rear boosters custom cut to feed the Motorcraft (also over the counter performance parts) aluminum intakes for maximum performance. It also uses a smaller primary venturi. Vacuum secondaries allow smooth engagement. A little difficult to come by but also a period correct upgrade. FWIW

3/11/223:29 PM

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