LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Cam/ Vaccum question...

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Old 10-10-2004, 12:29 AM
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Cam/ Vaccum question...

I was wondering if anyone has had any noticable vaccum problems when upsizing their cam. I want to make sure I am getting the most out of it without the drawbacks. Of course this is probably an A4 question. Thanks!
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Old 10-10-2004, 02:45 AM
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Re: Cam/ Vaccum question...

Heads + 233/239 112lsa, 950 idle, just shy of 11 inches of vacuum. Sucks. Get a vac canister for brakes, it helps a lot.
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Old 10-10-2004, 10:06 AM
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Re: Cam/ Vaccum question...

See thats the cam I was interested in but the vaccum risks were bugging me. Did the canister fix your probs? How do you like the cam?
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Old 10-10-2004, 10:32 AM
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Re: Cam/ Vaccum question...

cc 306 (230/244)... no problems..brakes feel great.
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Old 10-10-2004, 12:40 PM
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Re: Cam/ Vaccum question...

Brakes are very weak compared to stock, more due to hogged heads then the cam alone (stock heads would probably make 1.5-2 inches more vacuum) Canister helps immensely, planning on an ls1 brake upgrade though, to help with the braking. I love the cam
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Old 10-10-2004, 01:15 PM
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Re: Cam/ Vaccum question...

It seems that once you start to get to ~230 degreesntake duration at 0.050" that the vacuum starts become marginal.

Rich
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