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Anyone with a 770 cfm Truck Avenger

Discussion in 'The Garage' started by crazyrc, Jun 13, 2004.

  1. crazyrc

    crazyrc 1/2 ton status

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    If anyone is runing the 770 cfm version of the holley, could you tell me where or how you supply vacuum to your brake booster. My 670 had a provision for the brake booster. (about 3/8") My 770 has no such hookup...please inform. /forums/images/graemlins/confused.gif
     
  2. Z3PR

    Z3PR Banned

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    [ QUOTE ]
    If anyone is runing the 770 cfm version of the holley, could you tell me where or how you supply vacuum to your brake booster. My 670 had a provision for the brake booster. (about 3/8") My 770 has no such hookup...please inform. /forums/images/graemlins/confused.gif

    [/ QUOTE ]Isn't there a vacume port on the rear of your intake manifold ?? If not, you could always get a carb spacer with a vacume port..... Just a thought.
     
  3. unclematty

    unclematty 1/2 ton status

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    [ QUOTE ]
    [ QUOTE ]
    If anyone is runing the 770 cfm version of the holley, could you tell me where or how you supply vacuum to your brake booster. My 670 had a provision for the brake booster. (about 3/8") My 770 has no such hookup...please inform. /forums/images/graemlins/confused.gif

    [/ QUOTE ]Isn't there a vacume port on the rear of your intake manifold ?? If not, you could always get a carb spacer with a vacume port..... Just a thought.

    [/ QUOTE ]good plan /forums/images/graemlins/waytogo.gif
     
  4. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    There should also be a spot for a threaded fitting on the manifold behind the carb IIRC.
     
  5. crazyrc

    crazyrc 1/2 ton status

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    There is a spot, but like you say I'll have to get spacer, because the carb sits too close to get a fitting in the manifold. Do you know of any manufacturers who make a spacer with a port?
     
  6. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    TransDapt Performance Products, TRD-2103 on SummitRacing.com for $18.88. They call it a PCV fitting, but it should work.

    Speaking of PCV, why not just get a plastic barbed "T" fitting and run the brake booster in with the PCV line.

    A carb spacer changes tuning characteristics of the carb, and you may not like the results.
     
  7. Z3PR

    Z3PR Banned

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    [ QUOTE ]
    There is a spot, but like you say I'll have to get spacer, because the carb sits too close to get a fitting in the manifold. Do you know of any manufacturers who make a spacer with a port?

    [/ QUOTE ]Could you pull the carb, install a elbow fitting for the vac line, then reinstall the carb ?? Is there enough room for one of those ??
     
  8. crazyrc

    crazyrc 1/2 ton status

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    [ QUOTE ]
    [ QUOTE ]
    There is a spot, but like you say I'll have to get spacer, because the carb sits too close to get a fitting in the manifold. Do you know of any manufacturers who make a spacer with a port?

    [/ QUOTE ]Could you pull the carb, install a elbow fitting for the vac line, then reinstall the carb ?? Is there enough room for one of those ??

    [/ QUOTE ]

    I think there might be enough room, but a friend who was working on the truck with me doesn't think so...only one way to find out. Thanks for the replies.
     
  9. great scott

    great scott 1/2 ton status

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    I have one on my 454 bolted to a dual plain spred bore type manifold, so I have an adaptor to fit the holey. The local parts store had the adaptor in stock. I have had no problems with the booster hose but the carb was a wast of money, I'm not sure it betters my 30 year old Q-jet in any way and it certinly is not fuel injection
     

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