Thread: Vacuum Secondary vs Mechanical Secondary
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Old 02-16-2017, 07:53 PM
Z Man Z Man is offline
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Join Date: Aug 2011
Cobra Make, Engine: ERA, 427 FE Dual Quads
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Default Vacuum Secondary vs Mechanical Secondary
I have an ERA Cobra with a 427 FE and dual 4160 Holleys (600CFMs). After lots of tuning attempts, I feel I may be over carbureted and want to make a change. Holley offers 2 smaller carbs, 390 CFM with vacuum secondaries and 450 CFM with mechanical secondaries. I have zero experience with the mechanical secondaries. Any thoughts? Thanks!!
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