How much vacuum should I be getting?
I have a 385 (.30 over 383). If I remember correctly, it has either a 9 or 9.5:1 compression ratio (I forgot and have lost the build sheet). I have a 222*/232* @0.50 .447" lift cam w/ 111* LSA, 1.6 ratio roller rockers. The engine has mildly ported iron pro-topline heads w/ 180cc intake runners, 64cc combustion chambers, 2.02/1.60 valves. I have the performer RPM air gap intake w/ a 650 cfm vacuum secondary holley carb. What kind of vacuum should I pull?
I'm thinking of putting on a brake booster is why I ask, and I believe my vacuum may be a little low.
Black 1968 Coupe.
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Modern, fuel injected LS engine DAILY DRIVER!