Cam upgrade kits with springs etc
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  1. #1
    Stroker Kustom Jim's Avatar
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    LightbulbCam upgrade kits with springs etc

    Looking at some sbc retro roller cam upgrades and you can get a kit and caboodle and not just the cam.
    Which I understand is handy it if it's all from the same company.
    COMP Cams K12-432-8: Comp Cams 'Xtreme Energy' Hydraulic Roller Camshafts | JEGS

    Purely out of technical interest when they say stock springs no good etc that throws up a few questions...
    (bearing in mind heads are mild Edelbrocks to start with - and I wouldn't ignore recommendations)

    1, does it mean that generally the stock springs will be too weak and valves may float ?

    2, stock springs may crush with the extra lift - stock head says max lift .490 and new cam claims .520

    C, does that not make the actual valves/stems too short or summat ? unlikely I imagine, what's 30 thou between friends - no kits state new valves required, just wondering.

    4, also states heads need machining! what for ?


    many thanks in advance

    Jimbob
    "I'm not going to take this defeatist attitude and listen to all this crap any more from all these people who have nothing except doomsday to predict."
    Carroll Shelby

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    Official RnS Addict mygasser's Avatar
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    in order 1- yes
    2- they may get coil bound
    3/4- valves ok but as the lift is more than the max' of the head the guides where the seal sits will need machining down so the keeper/retainer doesn't hit it
    need a job done on your project? i may be able to help.

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    Stroker Kustom Jim's Avatar
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    Brilliant reply.

    Give that man a ceegar

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    Stronger valve springs are only needed if you are going to rev the motor above 6000 rpm

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    Off the Xmas card list kapri's Avatar
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    Quote Originally Posted by mygasser View Post
    in order 1- yes
    2- they may get coil bound
    3/4- valves ok but as the lift is more than the max' of the head the guides where the seal sits will need machining down so the keeper/retainer doesn't hit it


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    My name is Martin 30psi's Avatar
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    Quote Originally Posted by NMNeil View Post
    Stronger valve springs are only needed if you are going to rev the motor above 6000 rpm
    I wouldn't guarantee that. I've seen stock springs on a big block Ford that were very weak. I could open the valves with the base of my palm easily.

    For the sake of the extra cost, it's best to spend the extra money on new springs. You never want a valve being a bit indecisive about returning to its seat whilst its got a piston coming up close to its face.
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    Official RnS Addict mygasser's Avatar
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    Quote Originally Posted by 30psi View Post
    I wouldn't guarantee that. I've seen stock springs on a big block Ford that were very weak. I could open the valves with the base of my palm easily.

    For the sake of the extra cost, it's best to spend the extra money on new springs. You never want a valve being a bit indecisive about returning to its seat whilst its got a piston coming up close to its face.
    need a job done on your project? i may be able to help.

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    Quote Originally Posted by 30psi View Post
    I wouldn't guarantee that. I've seen stock springs on a big block Ford that were very weak. I could open the valves with the base of my palm easily.

    For the sake of the extra cost, it's best to spend the extra money on new springs. You never want a valve being a bit indecisive about returning to its seat whilst its got a piston coming up close to its face.
    True, but I only meant stock springs in good condition.
    The only reason for using stronger springs in a engine is to overcome the valves inertia at higher than factory rpm's.
    Putting stronger springs in a stock engine simply increases stress and wear on the valvetrain.

  11. #9
    Official RnS Addict mygasser's Avatar
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    Quote Originally Posted by NMNeil View Post
    True, but I only meant stock springs in good condition.
    The only reason for using stronger springs in a engine is to overcome the valves inertia at higher than factory rpm's.
    Putting stronger springs in a stock engine simply increases stress and wear on the valvetrain.
    not just higher rpm, some cams have much steeper ramps on the lobes that require more valve control.
    need a job done on your project? i may be able to help.

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    Official RnS Addict WB54's Avatar
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    Head may need skimming to achieve correct compression ratio

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