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Stock pushrods ?

This is a discussion on Stock pushrods ? within the Internal Engine forums, part of the LSx Technical Help Section category; Originally Posted by Wesman I agree, upgraded springs are always good. However, I don't think the issue is happening at ...

  1. #21
    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Wesman View Post
    I agree, upgraded springs are always good.

    However, I don't think the issue is happening at 6,000RPM. I think it is a result of an overrev situation (missed shift) or too much pounding against the rev limiter over time.

    Either way, the stock pushrods are not very strong.
    The rev limiter is not what is bending pushrods. Seems everyone looks at the limiter as a bad thing. Technically you should be able to lay the motor on the limiter and life is good.
    I use a 2 step on one of the cars, and just lay the motor on it until the green drops. That's the idea of it.

    Which is why I say if people are hitting the limiter and finding bent pushrods,,,that tells me the springs are weak and the engine is obviously hitting valve float before the limiter is reached. You might not hear it or feel it. It usually starts as a loss of power before the shift point is reached. On a dyno it's easy to see.

    The only way to rev past the limiter would be a downshift situation where the drivetrain forces the motor up and over the limiter. Otherwise these motors should be able to lay on that limiter without damage, providing it has a valvetrain capable (namely the springs)

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    King 0f n00bz shady milkman's Avatar
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    it is my understanding..i believe it is in my book about the gen IIIs..that the stock springs are incredibly weak..barely applicable for the stock application...and the engineers knew this so they put in the soft pushrods to prevent catastrophic damage in higher mileage engines

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by shady milkman View Post
    it is my understanding..i believe it is in my book about the gen IIIs..that the stock springs are incredibly weak..barely applicable for the stock application...and the engineers knew this so they put in the soft pushrods to prevent catastrophic damage in higher mileage engines
    Yep, and the springs are the start of the whole problem. If they controlled valve action like they should, there wouldn't be bent pushrods.
    Just another one of those goofy things GM did. It's easy and cheap enough to correct though.

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Yep, and the springs are the start of the whole problem. If they controlled valve action like they should, there wouldn't be bent pushrods.
    Just another one of those goofy things GM did. It's easy and cheap enough to correct though.
    very true .... spend 1k + to get new heads

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by shady milkman View Post
    very true .... spend 1k + to get new heads
    I'm with ya, use it as an excuse to buy more parts. That's how I talk my wife into it

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    So what's a good upgrade for the springs? 918s? How long will those last?

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    Moderator Firebirdjones's Avatar
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    Quote Originally Posted by Cumbias View Post
    So what's a good upgrade for the springs? 918s? How long will those last?
    918's would be a good idea and should work fine with the stock cam, I don't think the seat pressure on those are that outragous. It would benefit you even more if you decided down the road to upgrade with a mild camshaft.

    Another possible option would be a set of new LS6 springs.

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