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Vacuum Secondary vs Mechanical Secondary Vacuum Secondary vs Mechanical Secondary
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Old 02-17-2017, 03:56 PM
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Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
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Have to go with Patrick on this. Even the Chev L88 used a vacuum secondary carb in most factory installed applications and some of the L88 cams were up around 275 deg @ .050. They were nasty and wild. My 427 Vette runs a 256/266/,579/.605 cam, pulls 8 inch vacuum at idle on a good day and does fine with a vacuum secondary Holley. My dual quad 459 FE is considerably calmer with a 230/236 cam but it is very smooth and responsive with 1850 carbs. The reproduction progressive linkage works very smoothly on it. It even seems to be pretty easy on gas although I've never actually calculated the mileage.
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