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I have a .630 lift...?

This is a discussion on I have a .630 lift...? within the Internal Engine forums, part of the LSx Technical Help Section category; I have a .630 lift cam for my 98 TA. my question is does anyone kno if the valves will ...

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    I have a .630 lift...?

    I have a .630 lift cam for my 98 TA. my question is does anyone kno if the valves will hit the stock pistons, has anyone experienced this or does anyone kno if it will work or not? any help would be great!

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    Slow'er'Ass Mr. Luos's Avatar
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    Not anywhere near enough information to give an answer.


    Best bet....MEASURE!

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    okay well then i guess my question is what is the biggest cam u can run with the stock pistons?

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by MurderedOutTA View Post
    okay well then i guess my question is what is the biggest cam u can run with the stock pistons?
    Depends on several things.

    Sorry, but there is no simple answer to valvetrain geometry.

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    Junior Member redrocketws6's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    Depends on several things.

    Sorry, but there is no simple answer to valvetrain geometry.
    crack that whip I get those questions all the time at summit. and that is exactly what i say.

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by redrocketws6 View Post
    crack that whip I get those questions all the time at summit. and that is exactly what i say.
    And besides that....most don't need the 'biggest cam' they can get....

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    holy mother of god! 630 lift?! how big is your motor?

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    Quote Originally Posted by TmaxicanA View Post
    holy mother of god! 630 lift?! how big is your motor?
    There are cams for the 346 that push .650 on the exhaust side (if I recall correctly) but the LSA has to be tight.

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    Junior Member redrocketws6's Avatar
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    Quote Originally Posted by Mr. Luos View Post
    And besides that....most don't need the 'biggest cam' they can get....
    Exactly..especially if the person plans to drive it on the street. Picking the right cam for your needs takes a lot of work. i'd recommend calling comp cams to get there advice. After all that is what they do.

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    Duration has much more to do with PTV than lift since max lift occurs near BDC. The biggest you can fit w/o flycutting is somethin like a Trex, Polluter, MS4 etc.... Those cams suck though if you don't have a high stall (A4) and gear......

    Even those cams you need to measure PTV and are under the recommended .080 intake and .100 exhaust minimums...

    OP what is the duration, LSA and advance (or installed ICL) on your cam.....
    Last edited by SOMbitch; 10-19-2010 at 02:44 PM.

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    I have a '98 w/ a .621 lift cam, daily driver ... I have 243 heads with the lighter stock valves with stock pistons ... no problems. but as Luos said ... MEASURE before buying a set of valves and pistons is the least of your worries

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    midnight blue
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    Don't the stock rockers go into bind or lock after .625 lift. I thought I saw that somewhere.

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Kevin Wilson View Post
    Don't the stock rockers go into bind or lock after .625 lift. I thought I saw that somewhere.
    Been running stock rocker arms for 18K with a 248/254 629/622 113 cam. Not a problem.

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    midnight blue
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    Ok. I wasn't stateing a fact it was more of a question.

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    midnight blue
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    So how much lift can you run on stock rockers. I know there is a limit because of the way they are designed. They will only rotate so far and then they hit the flat.

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