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Thread: LT4 cams SPecs?

  1. #1
    Member Nick90vetteguy's Avatar
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    Default LT4 cams SPecs?

    Anybody know the REAL specs for teh LT4 hot cams and what changes are to be made, to install them in a L98?

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    Member BADDUCK's Avatar
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    Not sure what you mean by REAL but:

    valve lift (1.5) .492 .492
    duration @ .50 .218 .228
    lobe separation 112*

    You can look this stuff at any major GM parts dealer. ie Summit

    You will need the LT4 101# valve springs and maybe some shims to get the height just right.

    BTW you will need a tune to make it run right.

  3. #3
    Member Nick90vetteguy's Avatar
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    i heard alot of different things lol

    will this work?

    GM Performance 12480002 - GM Performance LT4 Hot Cam Hydraulic Roller Cam Kits - Overview - SummitRacing.com

    and will this harm my fuel injection?

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    Quote Originally Posted by Nick90vetteguy View Post
    will this work?
    Yes it will work ;That is the std GMPP Hot cam kit;.
    But the hot cam uses 1.6 lifters to get the lift.
    You could buy a off the shelf cam only with similar lift from someone else ( $250-$300 ) that doesn't need the 1.6 rockers
    Also to really make that work in a TPI you would want some good intake mods because hot cam revs higher than what stock TPI will breath.There are better cams out there for TPI engines

    Quote Originally Posted by Nick90vetteguy View Post
    and will this harm my fuel injection?
    no

  5. #5
    Member BADDUCK's Avatar
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    That kit includes the 1.6 full rockers. They used to be aluminum RR's made by Crane. It also includes the springs I suggested. That should be everything you need for the install. You will need to cut back the drip tabs in your valve covers for clearance when using the complete kit.
    You will also need a tune.

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    Member Nick90vetteguy's Avatar
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    Are LT4 cams worth it? or am i better off keepin the stock ones?

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    Member BADDUCK's Avatar
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    Quote Originally Posted by Nick90vetteguy View Post
    Are LT4 cams worth it? or am i better off keepin the stock ones?
    LT4 cams are fine. It wouldn't be my choice if you plan to keep your TPI. The LT4 cam was designed for a short runner intake like the LT1/LT4. Your stock cam is kinda wimpy, it really depends on what your goals are. If you are going to just do just a cam for now I would do a TPiS ZZ9 cam with Scorpion SA 1.6 ratio full RR's and LT4 springs.

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    Member Nick90vetteguy's Avatar
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    I see, now is there an easier way other than me to take the engine out to install the cams? possibly take of the intake manifold and dig from there?

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    Member BADDUCK's Avatar
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    Nope....you need to by a engine book and study it. Or better yet a FSM for your car.

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    Quote Originally Posted by BADDUCK View Post
    ...you need to buy a engine book and study it. Or better yet a FSM .


    Quote Originally Posted by Nick90vetteguy View Post
    is there an easier way other than me to take the engine out to install the cams? possibly take of the intake manifold and dig from there?
    Intake has to come off regardless of how you do it
    Only other way is to pull radiator out and remove cam while engine still in car

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