question for guys running the comp cam 280H

Discussion in 'Engine Topic' started by cutty, Apr 25, 2012.

  1. cutty

    cutty Veteran Member

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    just wondering what kind of vacuum you guys are getting say, in a idle in park?
     
  2. cutty

    cutty Veteran Member

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    forgot to add, its in a 355
     
  3. AJ_72

    AJ_72 Veteran Member

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    I have that cam, but it's hard to say because I have a reserve vacuum canister.

    Last I checked (when I was setting my idle mixture screws) it's ~12 in/hg but that may be irrelevant because of the canister.

    Mine's also a 350, Vortec heads, Weiand dual plane intake, Holley 650DP, Magnum 280 cam, plus I have Rhoads lifters.

    I took all the necessary precautions to make sure I had brakes at idle. :) Been there, done that. Don't want to do it again.
     
  4. zachisageek

    zachisageek Veteran Member

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    The last time I checked I had something like 17" at idle.
     
  5. vlmohr

    vlmohr Veteran Member

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    Vacuum canister shouldn't affect manifold vacuum. It's only a reservoir to store vacuum to run vacuum operated accessories while under a load if it's hooked up correct. My son's 383 has about 12 also.
     
  6. Rene Melten

    Rene Melten Veteran Member Lifetime Gold Member

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    Sounds as as if you may be ok, the 284H in mine is 9-10 in/hg, using a 4sp though. 12 sounds about right?
     
  7. AJ_72

    AJ_72 Veteran Member

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    I wouldn't think so either since it's really only hooked to the brake booster, but just wanted to be sure all info was given. ;)
     
  8. 5spd540

    5spd540 Veteran Member Lifetime Gold Member

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    I had a 360 that made almost no vac so the brakes sucked
     
  9. bitchin'71SS

    bitchin'71SS Veteran Member

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    I run that cam in my 383 no problems with vacuum ever, brake booster works fine. also putting one in my buddys 355 which is also a mild street 355, great street cam.
     
  10. cutty

    cutty Veteran Member

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    i ask as i hooked a gauge up and getting only 10 inch's in park in a idle,ive check and rechecked timing and played with carb but 10 seems to be the highest i can get out of it
     

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