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1:85 Rockers on 99 LS1

This is a discussion on 1:85 Rockers on 99 LS1 within the Internal Engine forums, part of the LSx Technical Help Section category; I just purchased a set of SLP 1.85 Rockers for my 99 LS1. I was wondering if I need to ...

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    1:85 Rockers on 99 LS1

    I just purchased a set of SLP 1.85 Rockers for my 99 LS1. I was wondering if I need to get different pushrods or if the stock springs will hold up to increased lift? Should I test where they contact the valve with an adjustable pushrod?
    Before you say there are better things I could spend my money on to build power, well, I purchased these for a great price. So, no thats cleared up, any suggestions are welcome!
    Also, I would ask SLP, but they would lie to me to get me to spend even more money!
    Last edited by 9t8z28; 05-20-2007 at 06:17 AM.

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    Senior Member bills98ta's Avatar
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    They will work ! You should at least upgrade the valve springs.. They are the weak link on floating out the valves... I ran a Z06 cam with the 1.85's and made awesome power !!! Good Luck !!!

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    O.K., but what valve springs do you recommend? I am on a budget!

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    Senior Member bills98ta's Avatar
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    Comp Cams beehive springs... They are good to a .600 lift ! With the 1.85's, you will increase your lift !

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by bills98ta View Post
    Comp Cams beehive springs... They are good to a .600 lift ! With the 1.85's, you will increase your lift !
    Yeah, it should make it a total lift of .544

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    Senior Member bills98ta's Avatar
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    You can put them in, but stay clear of the rev limits. I bent four intake valves from floating them out... With the new springs, I run 7000rpm at the track with no problems !!! You will feel the difference !

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    Quote Originally Posted by bills98ta View Post
    You can put them in, but stay clear of the rev limits. I bent four intake valves from floating them out... With the new springs, I run 7000rpm at the track with no problems !!! You will feel the difference !
    O.K. so what are you saying? What else should I upgrade? Or are you just saying to not hit the rev limiter?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Thanks for all the help!

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    Senior Member bills98ta's Avatar
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    I wouldn't over rev until you did the spring upgrade. As far as what else to upgrade, you could go with the titanium spring retainers & keepers... They are lighter, which means less weight bouncing up & down ! The springs can be installed with out removing the heads if you know what you're doing !

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    Senior Member bills98ta's Avatar
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    Are you in Franklin County ???

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by bills98ta View Post
    I wouldn't over rev until you did the spring upgrade. As far as what else to upgrade, you could go with the titanium spring retainers & keepers... They are lighter, which means less weight bouncing up & down ! The springs can be installed with out removing the heads if you know what you're doing !
    Yes, I know what I am doing. I already have all of the stuff to do it. I got a .600 lift can in my 396 BB and I know what its like to break valves!

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by bills98ta View Post
    Are you in Franklin County ???
    No, I am in Bucks County which is eastern Pa, close to Philadelphia. Where is Franklin County?

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    member since may 2000 nhraformula's Avatar
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    Quote Originally Posted by 9t8z28 View Post
    O.K., but what valve springs do you recommend? I am on a budget!
    when i had 1.85 rocker, i used the ls6 springs
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

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    Quote Originally Posted by nhraformula View Post
    when i had 1.85 rocker, i used the ls6 springs
    So were they adequiet? Are they cheaper then the Comp Cams?

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Are the pushrods going to need to be upgraded? What kind are the factory pushrods?

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    Senior Member bills98ta's Avatar
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    Franklin is on the MD line on I-81... There's a doylestown near by, thought I'd give you a hand... Com has a valve train upgrade kit that has everything too. I bent pushrods too, but because the valves hit the pistons... ( weak springs )

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