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Are new Valves necessary for rebuild??

This is a discussion on Are new Valves necessary for rebuild?? within the General Help forums, part of the LSx Technical Help Section category; What up LS1's......my question is do I need to have new intake/exhaust valves for my rebuild?? I just ordered the ...

  1. #1
    Member jb3golf's Avatar
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    Talking Are new Valves necessary for rebuild??

    What up LS1's......my question is do I need to have new intake/exhaust valves for my rebuild?? I just ordered the Texas Speed 224R on 114LSA w/7.35 hardened pushrods to match the LS7 Lifters I ordered. I also purchased the updated 918 Spring from Comp Cams.

    Additionally I'm having my stock heads ported & polished.
    Since I have a 98 6speed LS1 I also purchased ARP Rod Bolts for insurance. My car has 59,000 miles on it.

    Any suggestions would be appreciated. Thanks.

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    I don't sell out! blackSS01's Avatar
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    Quote Originally Posted by jb3golf View Post
    What up LS1's......my question is do I need to have new intake/exhaust valves for my rebuild?? I just ordered the Texas Speed 224R on 114LSA w/7.35 hardened pushrods to match the LS7 Lifters I ordered. I also purchased the updated 918 Spring from Comp Cams.

    Additionally I'm having my stock heads ported & polished.
    Since I have a 98 6speed LS1 I also purchased ARP Rod Bolts for insurance. My car has 59,000 miles on it.

    Any suggestions would be appreciated. Thanks.
    Your vavles will be fine. You would gain more power if you got a angle job and new/bigger valves but don't sweat it.
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    Member jb3golf's Avatar
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    Thanks man I appreciate the info. Have good night.

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    Quote Originally Posted by jb3golf View Post
    What up LS1's......my question is do I need to have new intake/exhaust valves for my rebuild?? I just ordered the Texas Speed 224R on 114LSA w/7.35 hardened pushrods to match the LS7 Lifters I ordered. I also purchased the updated 918 Spring from Comp Cams.

    Additionally I'm having my stock heads ported & polished.
    Since I have a 98 6speed LS1 I also purchased ARP Rod Bolts for insurance. My car has 59,000 miles on it.

    Any suggestions would be appreciated. Thanks.
    Since itís a 98 replace the oil pump while youíre doing the cam. 98s are famous for their oil pumps to just stop work with out any warning. For valves you should be fine, but like said before, a nice set of lighter and good 3 or 5angle job valves well do you well. Also Iíd replace the spring retainers with titanium retainers; they are not that expensive and well greatly reduces your valves train weight and reduce your chances of floating a valve.
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    Moderator Firebirdjones's Avatar
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    Hard to tell from the internet whether the valves are re-usable.

    Most cases they are. Depends on mileage, type of guides used, type of rockers used and the camshaft. From what I've seen,,,even stock cast iron guides are worn to excessive clearances in as little as 70,000 miles with a stock camshaft.
    A good machine shop will mic everything to make sure you have proper valve guide clearance. Sometimes replacing the guides alone aren't enough to bring it back to spec if the valve stems are worn excessively. If they say they will nurl the guides take them somewhere else.
    Too much clearance and you have oil sucking issues. To little and you have a gulled up valve guide and a valve that hangs in the head, then the piston smacks it. Either way, use a reputable shop.

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    Member jb3golf's Avatar
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    Quote Originally Posted by vetteemt View Post
    Since itís a 98 replace the oil pump while youíre doing the cam. 98s are famous for their oil pumps to just stop work with out any warning. For valves you should be fine, but like said before, a nice set of lighter and good 3 or 5angle job valves well do you well. Also Iíd replace the spring retainers with titanium retainers; they are not that expensive and well greatly reduces your valves train weight and reduce your chances of floating a valve.
    Thanks man I appreciate the info. You know I actually ordered chromoly spring retainers. I read that Titanium retainers don't hold up as long to the friction as chromoly......I also read chromoly is lighter than plain steel.........I'd appreciate your thoughts on that also........Yeah and the Oil pump...good call.....I'm actually waiting to purchase the Lingenfelter High Volume Oil pump to complete my parts list. Thanks again for the help....

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    Member jb3golf's Avatar
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    Quote Originally Posted by Firebirdjones View Post
    Hard to tell from the internet whether the valves are re-usable.

    Most cases they are. Depends on mileage, type of guides used, type of rockers used and the camshaft. From what I've seen,,,even stock cast iron guides are worn to excessive clearances in as little as 70,000 miles with a stock camshaft.
    A good machine shop will mic everything to make sure you have proper valve guide clearance. Sometimes replacing the guides alone aren't enough to bring it back to spec if the valve stems are worn excessively. If they say they will nurl the guides take them somewhere else.
    Too much clearance and you have oil sucking issues. To little and you have a gulled up valve guide and a valve that hangs in the head, then the piston smacks it. Either way, use a reputable shop.
    Good info!!!! Man your right on....in fact my neighbor was just telling me to take my valves to a good shop so they can refreshen them....will do...Thanks .......

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    Has any one had any trouble breaking stock ls1 valves with a 600 lift cam?

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