C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Big cams vs vacuum

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Old Jul 15, 2010 | 06:20 AM
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Default Big cams vs vacuum

I'd like to see or hear how much vacuum are your engines with
bigger than stock cams making at idle?!
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Old Jul 15, 2010 | 08:52 AM
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406 CID, ZZX cam 240/240 @ .050 on a 112 LCA installed at a 108 ICL, with 1.6 rockers, .595 lift with the rockers, 850 idle speed. This ends up with 10" of vacuum.

Last edited by bjankuski; Jul 15, 2010 at 01:53 PM.
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Old Jul 15, 2010 | 10:45 AM
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I wouldn't call this "big" at all but here are the numbers anyway:

350'ish CID L98 intake setup, ZZ4 cam w/ 1.6 RR ~.540'ish total lift, stock heads/valves = 18" @ 750 RPM

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Old Jul 15, 2010 | 07:32 PM
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401 sbc, 233/233 .564/.564 112 lsa on a 110 ICL. 950-1000 rpm idle, about 15" of vacuum
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