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roller Rockers on a stock LS1

This is a discussion on roller Rockers on a stock LS1 within the Internal Engine forums, part of the LSx Technical Help Section category; Any gains from these or driveability issues on a stock motor with just a K&N FIPK and magaflow cat back? ...

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    Member Justin93's Avatar
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    roller Rockers on a stock LS1

    Any gains from these or driveability issues on a stock motor with just a K&N FIPK and magaflow cat back? Im thinking the 1.7 ratio as I believe stock is 1.6 correct me if im wrong? Thanks for the help.

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    Quote Originally Posted by Justin93 View Post
    Any gains from these or driveability issues on a stock motor with just a K&N FIPK and magaflow cat back? Im thinking the 1.7 ratio as I believe stock is 1.6 correct me if im wrong? Thanks for the help.
    stock rocker ratio on a LS1 is 1.7...

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    Quote Originally Posted by Spaz View Post
    stock rocker ratio on a LS1 is 1.7...
    What would be a good ratio to go with then?

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    Quote Originally Posted by Justin93 View Post
    What would be a good ratio to go with then?
    the same ratio... less problems later on if you decide to get a cam... i wouldn't expect more than 3hp gain from them... but you should notice a little faster rev... they will come in handy further down the road...

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    Quote Originally Posted by Justin93 View Post
    What would be a good ratio to go with then?
    Leave them stock.

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    If anything, upgrade to a better rocker that doesn't like to puke out needle bearings.

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    Quote Originally Posted by 9t8z28 View Post
    If anything, upgrade to a better rocker that doesn't like to puke out needle bearings.
    Exactly. From what I've seen and been told, the stock rocker is almost perfect as far as geometry goes. Just get the Harland Sharp rocker upgrade. It just replaces the roller fulcrum and fixes the needle bearing issue on the stockers.

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    cool I'll check those out. Thanks

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    Quote Originally Posted by squee View Post
    Exactly. From what I've seen and been told, the stock rocker is almost perfect as far as geometry goes. Just get the Harland Sharp rocker upgrade. It just replaces the roller fulcrum and fixes the needle bearing issue on the stockers.
    On a stock cam, yes. On an aftermarket cam, no. With more lift and the smaller base circle, the stock rocker geometry provides a wide wipe pattern that is difficult to correct. Much easier to correct with a good roller rocker.

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    Quote Originally Posted by vettenuts View Post
    On a stock cam, yes. On an aftermarket cam, no. With more lift and the smaller base circle, the stock rocker geometry provides a wide wipe pattern that is difficult to correct. Much easier to correct with a good roller rocker.
    Correct me if I am wrong, but isn't that something a slightly longer pushrod would fix?
    Refering to the smaller base circle of the cam.

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    so with a bigger aftermarket cam what rockers would you recommend mr.luos

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    Quote Originally Posted by QtrWhore View Post
    so with a bigger aftermarket cam what rockers would you recommend mr.luos
    I am running the stockers without issue.

    When the time comes, I will have Harland Sharp rebuild them.

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    Quote Originally Posted by Mr. Luos View Post
    Correct me if I am wrong, but isn't that something a slightly longer pushrod would fix?
    Refering to the smaller base circle of the cam.
    Pretty sure your right. With the correct pushrod, it should fix what hes referring to.

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    A few thing to keep in mind w/ the rockers (and anyone feel free to correct me if you think I'm wrong)

    1. The rollers will free up a few HP due to less friction/parasitic loss
    2. However, the roller rockers are heavier, so more "mass" moving around.

    W/ that being said, I would expect very little gain from rollers, but that's just MHO.

    dale

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    Quote Originally Posted by Mr. Luos View Post
    Correct me if I am wrong, but isn't that something a slightly longer pushrod would fix?
    Refering to the smaller base circle of the cam.
    A longer pushrod will only alter the lifter preload, it will not alter the wipe pattern. Gm set up the rockers to run a certain lift and fixed the pivot location within a tolerance that would provide an acceptable wipe. As you alter the lift then the wipe changes, and not for the better. Most don't check wipe patterns when they set up a new cam.

    One other point, as the wipe widens and you increase the spring loads to support and aftermarket cam, aftermarket heads with bronze guides will have a dramatic increase in guide wear. Bronze guides could wear out in as little as 10K miles given a bad setup.

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    By wipe...you mean side to side movement on the valve tip correct?

    I am running a .630 cam with stock rockers, and I have kept an eye on them. They haven't 'moved' side to side any more than it did when stock.

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    Quote Originally Posted by Mr. Luos View Post
    By wipe...you mean side to side movement on the valve tip correct?

    I am running a .630 cam with stock rockers, and I have kept an eye on them. They haven't 'moved' side to side any more than it did when stock.
    Are you using a different length pushrod?

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    Quote Originally Posted by squee View Post
    Are you using a different length pushrod?
    I have to with the Morel lifters.

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    Quote Originally Posted by Mr. Luos View Post
    I have to with the Morel lifters.
    Ah.

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    Quote Originally Posted by Mr. Luos View Post
    By wipe...you mean side to side movement on the valve tip correct?

    I am running a .630 cam with stock rockers, and I have kept an eye on them. They haven't 'moved' side to side any more than it did when stock.
    No, wipe would be movement from exhaust side to intake side

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