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Rocker arm QuesTionS ??? new to LS1

This is a discussion on Rocker arm QuesTionS ??? new to LS1 within the Internal Engine forums, part of the LSx Technical Help Section category; bump bump...

  1. #21
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    bump bump

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Quote Originally Posted by camarojunky74 View Post
    sweet i hope everything goes as planned, hope to see you in the 300's

    I dynoed 340 RWHP and 337 RWTQ

    The 1.85 deffinitly made a difference in the fact that I am at 400 HP.

    STOCK CAMSHAFT
    1998 - 2000 Fbody
    0.496" / 0.496" int/exh lift

    Basically going from a 1.75 to a 1.85 is a 10% increase in valve lift which would make the camshaft lift .545

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    Quote Originally Posted by 98ssboosted View Post
    So who in here just put on the 1:7 quick-lift rockers and nothing else?
    In order to run either ratio (1.7 or 1.8) of the quick lift rockers you need the kit, which comes with rockers, studs, guideplates, polylocks and shorter pushrods. Well worth the upgrade either ratio. The quick-lift geometry requires different length pushrods. Hope this helps.

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    So the 1:8's would work with everything stock. I would just have to get different valve covers?

    Does anyone know the hp difference between the 1:7 and 1:8.

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    Quote Originally Posted by 98ssboosted View Post
    So the 1:8's would work with everything stock. I would just have to get different valve covers?

    Does anyone know the hp difference between the 1:7 and 1:8.
    It all depends. Some people see a difference, some don't. I did notice a difference in power throughout the rpm band, especially from 5,000 to 6,000 RPM's.

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    well 1.8's are supposed to raise lift 10% higher than 1.7's so for ex. if you have a 525 lift cam ie zo6 cam, if you put 1.8's on your new lift at the valve will be 535, which anytime you have more lift and the heads and intake can support it you will make more power especially at peak power. personally i have not put my cam in yet nor put on 1.8 rockers so i dont know if you can feel a differance. but i trust 9t8z28 that you can feel it.

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    Quote Originally Posted by camarojunky74 View Post
    well 1.8's are supposed to raise lift 10% higher than 1.7's so for ex. if you have a 525 lift cam ie zo6 cam, if you put 1.8's on your new lift at the valve will be 535, which anytime you have more lift and the heads and intake can support it you will make more power especially at peak power. personally i have not put my cam in yet nor put on 1.8 rockers so i dont know if you can feel a differance. but i trust 9t8z28 that you can feel it.
    I may be wrong, but isn't 10% of .525 = .577 ?
    or am I calculating that wrong?

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    oh sh*t, you know your right i dont know how i caculated and only got 10 thousands, but that seems really far fetched taht rocker arms could raise the lift that much!! i read that 10% thing on crane cams new quick lift rocker arm write up. maybe this only applies to there arms? i dunno, and im punching around on the caculator and cant figure out how i got 10 thousands lol.

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    Quote Originally Posted by camarojunky74 View Post
    oh sh*t, you know your right i dont know how i caculated and only got 10 thousands, but that seems really far fetched taht rocker arms could raise the lift that much!! i read that 10% thing on crane cams new quick lift rocker arm write up. maybe this only applies to there arms? i dunno, and im punching around on the caculator and cant figure out how i got 10 thousands lol.
    Well, going from 1.75 to 1.85, is a 10% increase no matter what rocker arm it is. Same thing with my LT1 going from stock 1.52 to 1.62 Crane Roller Rockers.

    I think I am correct, anybody else have an opinion?

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    Also, can anybody explain just how the quick lift rockers work?

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    so if i go to the 1:8 quicklift rockers what valve covers will work?

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    so than if you use a cam that has 525 lift and than put on 1.8 rockers i can see 577 at the valve? thats a huge increase in lift! but if the numbers come out to that i cant argue with that, and also i am pretty sure you can use your stock valve covers you might have to grind them a little bit, in any case they will come with directions or you can buy valve cover spacers!

    and aslo from i understand of the quick lift rockers is that they use a 7.2 inch pushrod which is supplied in the kit, rather than 7.4 stock length. and the benefeit of this kit is it opens the valve quicker and larger than the other performance rockers at the same lift. before peak lift. so they give you higher lift at any given position of the cam compared to stock or other manufacturers. hope this makes sense but my understanding of how exactly it does this is still kinda cloudy

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    Quote Originally Posted by 98ssboosted View Post
    So the 1:8's would work with everything stock. I would just have to get different valve covers?

    answered in post #7 of this thread.

  14. #34
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    Quote Originally Posted by camarojunky74 View Post
    well 1.8's are supposed to raise lift 10% higher than 1.7's so for ex. if you have a 525 lift cam ie zo6 cam, if you put 1.8's on your new lift at the valve will be 535, which anytime you have more lift and the heads and intake can support it you will make more power especially at peak power. personally i have not put my cam in yet nor put on 1.8 rockers so i dont know if you can feel a differance. but i trust 9t8z28 that you can feel it.
    incorrect on the calulation. to get your new total lift number you do this:

    .525 / 1.7 X 1.8 = .550

  15. #35
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    Quote Originally Posted by 9t8z28 View Post
    Also, can anybody explain just how the quick lift rockers work?
    answered in post #11 of this thread.

  16. #36
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    Quote Originally Posted by 98ssboosted View Post
    so if i go to the 1:8 quicklift rockers what valve covers will work?
    answered in post #7. you grind the inside of the stock covers to clear.

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    Quote Originally Posted by camarojunky74 View Post
    so than if you use a cam that has 525 lift and than put on 1.8 rockers i can see 577 at the valve? thats a huge increase in lift! but if the numbers come out to that i cant argue with that, and also i am pretty sure you can use your stock valve covers you might have to grind them a little bit, in any case they will come with directions or you can buy valve cover spacers!
    that lift is incorrect. the correct formula is total valve lift, divided by current ratio multiplied by new ratio.

    .525 / 1.7 X 1.8 = .550

    Quote Originally Posted by camarojunky74 View Post
    and aslo from i understand of the quick lift rockers is that they use a 7.2 inch pushrod which is supplied in the kit, rather than 7.4 stock length. and the benefeit of this kit is it opens the valve quicker and larger than the other performance rockers at the same lift. before peak lift. so they give you higher lift at any given position of the cam compared to stock or other manufacturers. hope this makes sense but my understanding of how exactly it does this is still kinda cloudy

    it uses a 7.250 pushrod. looks like you understand it pretty well.

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    Quote Originally Posted by mrr23 View Post
    incorrect on the calulation. to get your new total lift number you do this:

    .525 / 1.7 X 1.8 = .550
    Thanks for clearing that up. I was wrong too.

  19. #39
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    nice, thanks for the help, greatly apprectiated

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    Quote Originally Posted by mrr23 View Post
    answered in post #11 of this thread.
    Yeah, I already read it. I don't see the difference from quick lift rockers and increased ratio rockers?

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