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Thread: LT1 rocker arm question

  1. #1
    Senior Member Carroll Shelby
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    LT1 rocker arm question

    Those that have stuck with the LT1, I have a question about rocker arm adjustment...or more specifically, the lack of FIXED adjustment.

    1. So this engine that Glenn built has about 45 hours on it and it is still putting out numbers within 10hp of what it did when he first dyno'd it. all good there.
    2. I did have to put a new set of lifters in it as it ate a lifter at about hour 3 in it's life very shortly after we bought the car.
    3. Glenn liked to run the valvetrain rather "loose" for my taste. say 1/4 turn or less of pre-load if I were to estimate it.
    4. I prefer 1/2 to 5/8 of a turn of preload as it keeps the valvetrain quiet and much less chance for problems.
    5. Lately, I've found that the rocker nuts aren't holding their settings for more than about 90 minutes of run time and backing off to nearly ZERO pre-load. PROBLEM.

    So, I found this as a two part problem. first by chance while chasing a valve cover leak and two as false knock that sends the computer into limp and pulling 20 degrees of timing.

    It is too late to switch to roller rockers for ECR...(rules question anyway though I've seen ford guys run them and I know tall valve covers have issue with the alternator)...so I'm left with finding new rocker nuts and running the valve train for the 4th time in as many months of running the car in fun events...this is getting old. What have you guys done to end this issue or have you just not had the issue?

    Gracias. See you guys at ECR...noisy valvetrain and all. yeeeehhaaaawwww!!
    Ah, fugg it.

  2. #2
    Senior Member Carroll Shelby Supercharged111's Avatar
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    Yeah roller rockers aren't gonna happen. I set mine at a full turn of preload in 2015 and haven't looked back since. You either need replacement studs or better nuts. Or try some poly locks on stock rockers?
    RM CMC Director

  3. #3
    Senior Member Carroll Shelby
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    Quote Originally Posted by Supercharged111 View Post
    Yeah roller rockers aren't gonna happen. I set mine at a full turn of preload in 2015 and haven't looked back since. You either need replacement studs or better nuts. Or try some poly locks on stock rockers?
    I put some new nuts on and things got quiet. I am sure there is some wear on the studs that isn't helping.

    Why a hard "not happening" on the roller rockers?
    Ah, fugg it.

  4. #4
    Senior Member Carroll Shelby Supercharged111's Avatar
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    Quote Originally Posted by AI#97 View Post
    I put some new nuts on and things got quiet. I am sure there is some wear on the studs that isn't helping.

    Why a hard "not happening" on the roller rockers?
    Because the stock stuff works fine. Roller rockers are an added expense. If we had guys all across the country galling rockers and nobody could get them to hold an adjustment that would be different.
    RM CMC Director

  5. #5
    Senior Member Carroll Shelby
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    Quote Originally Posted by Supercharged111 View Post
    Because the stock stuff works fine. Roller rockers are an added expense. If we had guys all across the country galling rockers and nobody could get them to hold an adjustment that would be different.
    Hmmm, are ferds allowed to have them? What about longtubes on an LT1?
    Ah, fugg it.

  6. #6
    Senior Member Carroll Shelby Fbody383's Avatar
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    Quote Originally Posted by AI#97 View Post
    What about longtubes on an LT1?
    Another no. Factory manifolds only. Still restricting from there anyway...

    // or someone will correct me //
    #39 CMC Camaro
    Orange is Fast!
    CMC-NT01 FTW!

  7. #7
    Senior Member Carroll Shelby Supercharged111's Avatar
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    Quote Originally Posted by AI#97 View Post
    Hmmm, are ferds allowed to have them? What about longtubes on an LT1?
    The 5.slows can as the Cobras came with them stock, but they need to be the factory correct type. Only stock manifolds need apply for the LT1. There's no point in opening that up as they need to be restricted anyway.
    RM CMC Director

  8. #8
    Senior Member Carroll Shelby RichardP's Avatar
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    If only there was a place you could go to get all these answers yourself...

    Richard P.

  9. #9
    Senior Member Carroll Shelby
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    Quote Originally Posted by RichardP View Post
    If only there was a place you could go to get all these answers yourself...

    Richard P.
    You do realize coreys 4th Gen had long tubes right...?
    Ah, fugg it.

  10. #10
    Senior Member Carroll Shelby
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    Quote Originally Posted by Supercharged111 View Post
    The 5.slows can as the Cobras came with them stock, but they need to be the factory correct type. Only stock manifolds need apply for the LT1. There's no point in opening that up as they need to be restricted anyway.
    I keep restricting and lowering hp but torque stays North of 317.59avg. Soon will be in the 240's and have illegal torque so looking for other ways to get hp... But kill torque. Short of cutting a custom cam.... Lol!
    Ah, fugg it.

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