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GTO rocker arm broke

This is a discussion on GTO rocker arm broke within the GTO forums, part of the Vehicle Specific category; Today I installed a mild Patriot cam (580 lift)with Crane 7.4 push rods and PSI LS1511ML springs there specs are ...

  1. #1
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    2006/ GTO

    GTO rocker arm broke

    Today I installed a mild Patriot cam (580 lift)with Crane 7.4 push rods and PSI LS1511ML springs there specs are :

    Outside Diameter Bottom - 1.260"

    Inside Diameter Top - 0.630"

    Seat Pressure @1.800" (installed height) - 120#

    Open Pressure @ 1.175" - 360#

    Spring Rate - 384 # per inch

    Maximum Lift - .625"

    Coil Bind - 1.100"

    Valve train is noisey and I broke a stock lifter in half with in the first 5 miles. These springs are supposed to be close to the crane 918 ( I thought ).
    Any ideas ?

  2. #2
    Senior Member bills98ta's Avatar
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    1998 Trans Am

    Are you sure the timing chain was install correctly ? A tooth off can cause the valves to hit the pistons and cause that kind of damage.

  3. #3
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    2006/ GTO

    The cam was installed right on the money. sounded great, in fact it ran like a bat out of hell.

  4. #4
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    problem solved I recieved ls7 springs by mistake. problem coil bind.

  5. #5
    Senior Member bills98ta's Avatar
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    Quote Originally Posted by Jackrabbit View Post
    problem solved I recieved ls7 springs by mistake. problem coil bind.
    Ouch... That will do it. Hope it didn't hurt any lifters. Good Luck !

  6. #6
    Grand Imperial Wizard Sarge's Avatar
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    Retired Outlaw Sum Bitch

    I thought I was the only one that did shit like this. I tried like a bitch to get a timing chain on a pickup one time all damn afternoon....just to find out it was the wrong one....

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