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LS1 Lifter vs LS7

This is a discussion on LS1 Lifter vs LS7 within the General Help forums, part of the LSx Technical Help Section category; how can you tell the difference (visually) between the two? also how can you tell if a lifter is bad ...

  1. #1
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    LS1 Lifter vs LS7

    how can you tell the difference (visually) between the two?
    also how can you tell if a lifter is bad when looking at it

    I have bad lifters and I am buying a set of used LS7s (used on a dyno motor only) and i want to be sure i am buying what im being told im buying and that they are in good shape

    thanks!

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Camaro98Z/28 View Post
    how can you tell the difference (visually) between the two?
    also how can you tell if a lifter is bad when looking at it

    I have bad lifters and I am buying a set of used LS7s (used on a dyno motor only) and i want to be sure i am buying what im being told im buying and that they are in good shape

    thanks!
    ls7


    worth noting is that the ls7 lifters are the new standard replacement for all 3-4th gens

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    dude!

    The ls1 lifter part number is referenced as the LS7. It would be very hard to buy new actual LS1 lifters.

  4. #4
    Member jb3golf's Avatar
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    BUT, remember to change to 7.350 pushrod length because the LS7 lifter is LONGER than the stock lifter......you will need to make up for this difference....

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    Member RARON455's Avatar
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    Quote Originally Posted by jb3golf View Post
    BUT, remember to change to 7.350 pushrod length because the LS7 lifter is LONGER than the stock lifter......you will need to make up for this difference....
    The LS7 lifter is not longer than the LS1, On the outside they measure the same overall length, the difference is in the cup height, the LS7 lifter cup is Higher in the bore than the LS1s. So jb3 ia correct, your pushrod length will be different.

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    Member jb3golf's Avatar
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    Quote Originally Posted by RARON455 View Post
    The LS7 lifter is not longer than the LS1, On the outside they measure the same overall length, the difference is in the cup height, the LS7 lifter cup is Higher in the bore than the LS1s. So jb3 ia correct, your pushrod length will be different.
    OK.......so the LS2/7 tray cup height is the difference????? OK, well that isn't the issue I was addressing...........My point was if one is re-using the LS1 cup with LS7 lifters. Many members state LS7 lifter in an LS1 cup have resulted in a shorter pushrod length (the most accurate being 7.35). In fact I confirmed this with Thunder Racing and Texas Speed, although measuring should always have the final say. So..........you may be right about YOUR statement, but I never involved the LS7 cup into the equation.....so your ia correct stuff isn't applicable in reference to the totality of MY statement. Thanks for the info though.......lol

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    Senior Member JoshuaGrooms83's Avatar
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    soooo any updates on this issue?

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    Member jb3golf's Avatar
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    Quote Originally Posted by JoshuaGrooms83 View Post
    soooo any updates on this issue?
    Nope....just the fact that I was admiring my rebutle statement to raron 455! Lol...owned! Just kidding......

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    Spaz is My Mentor SMWS6TA's Avatar
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    Wonder if this could be my problem?


    I just did a LS7 lifter swap and swapped in CM 7.4" push rods because I was told the length would not change with the new lifter.

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Wonder if this could be my problem?


    I just did a LS7 lifter swap and swapped in CM 7.4" push rods because I was told the length would not change with the new lifter.
    That is why I asked you if you changed your pushrod length. I bought a pushrod checker to see what my length will be. I wish it came with directions though.
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    Spaz is My Mentor SMWS6TA's Avatar
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    I wonder if the difference between the length has to do with which heads you have. The 98's have 8?? (something) while the later yrs use 241's.


    I just ordered a PR checker form ws6store. ($20 in case any one wants to know)

    I hope this is what my issue is. I just don't want to tear a block out and find out it's for something like this.

  12. #12
    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    I wonder if the difference between the length has to do with which heads you have. The 98's have 8?? (something) while the later yrs use 241's.
    Idk but I would check the length.

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