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SBC cam specs? what do I need?

Discussion in 'The Hokey Ass Message Board' started by briggs&strattonChev, Jul 3, 2005.

  1. briggs&strattonChev
    Joined: Feb 20, 2003
    Posts: 2,230

    briggs&strattonChev
    Member

    Howdy, i'm rebuilding the 3-fiddy in an 85 chevy shorty stepside, and i'd like to put in a cam as big as I can go, without having to change valve springs for something stronger. This isnt going to be any sort of "hot rod" motor, just a basically stock, 30 over 350, that i'd like to get some more power out of. The carb is a good rebuilt quadrajunk (before this, I didnt know it was possible for "good" and "quadrajet" to come in the same sentence lol).

    Whaddya think?

    Anyone have the specs of a cam that would fit this application?

    Any help is appreciated.

    Thanks, Briggs
     
  2. Steve M
    Joined: Jun 25, 2005
    Posts: 202

    Steve M
    Member

    The Comp XE256 should fit your needs.
     
  3. Mutt
    Joined: Feb 6, 2003
    Posts: 3,222

    Mutt
    Member

    I think it would be silly to put in "a cam as big as I can go, without having to change valve springs" in a basically stock 350 engine.

    The cam should work with the rest of the motor, including the intake, exhaust, ignition, compression, and if it's an automatic, the converter.

    Call the cam manufacturers, and give them the specs of your motor, and they will give you the best selection for your setup.


    Mutt
     
  4. brandon
    Joined: Jul 19, 2002
    Posts: 6,039

    brandon
    Member

    i was going to say a comp 268 high energy ......had one in my 48 chev ...and my 63 valiant......had a nice idle and would work with a stock converter......brandon
     
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  5. draggin'GTO
    Joined: Jul 7, 2003
    Posts: 1,307

    draggin'GTO
    Member

    Use the Summit 1102 cam (204/214@.050,.420..442" lift).

    You really can't get away with running much more lift without wearing out a set of stock springs pretty quickly.

    There ain't no shame in putting in a new stock Chevy cam either. Part # 968711 (195/202@.050,.390/.410" lift), the same cam came in 200, 270, 295 & 300 HP 350 engines. A fresh one (without the worn-out lobes that most of us have experienced driving old Chevy engines) runs damn fine and gets good economy, especially in a parts-runnin' half-ton.
     
  6. Derek
    Joined: Dec 12, 2004
    Posts: 193

    Derek
    Member

    This is usually the best thing to do in my experience. Even the most experienced builders that I know will consult with the manufacturer before making a final decision on the cam. That'sa waht those tech line guyus are there for and that's what they do. Give 'em a try.
     
  7. SinisterCustom
    Joined: Feb 18, 2004
    Posts: 8,205

    SinisterCustom
    Member

    I threw a reground cam ($40) with 280 degree duration and .480 lift in a stock, high mileage junkyard 350 for a camaro years ago. Ran really good until I let my brother borrow the car and he limps home with a rod knocking. :(
    Best advice though is what Mutt said above and call a few cam grinders for specs.

    Josh
     
  8. choprods
    Joined: Jul 11, 2002
    Posts: 8,285

    choprods
    Alliance Vendor

    I dodnt know shit about anything -BUT I do know what wokrs well when I drive it!
    I use a stock cam [or clone grind] of a 1973 Camaro Z-28....it had a 350 cu in and 350 Horsepower motor....it is PERFECT for an auto trans car and aboput as much as will work with stock convertor and stuff.....
     

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