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LS7 Lifter Question

This is a discussion on LS7 Lifter Question within the Internal Engine forums, part of the LSx Technical Help Section category; Originally Posted by mark21742 yes 98-99 are weaker and I'd never recomend anyone to spin 7,000rpms without rod bolts. now ...

  1. #21
    Member jb3golf's Avatar
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    Quote Originally Posted by mark21742 View Post
    yes 98-99 are weaker and I'd never recomend anyone to spin 7,000rpms without rod bolts.

    now for the honesty......
    I was doing the cam, oil pump, timing set upgrade.....while unbolting the pickup tube I dropped not only the bolt, but my 10mm wrench down into the ouk pan.......had to unbolt the oil pan to get the bolt and wrench out.
    so, its only 6-8 more bolts to drop the K member and pull the pan completely out at this point.

    tes I should have upgraded the bolts anyway, but I'm this far into the job already and would be a fool not to lol
    +1 on that. I've already got my whole suspension off and have the oil pan bolts off as well. I just need to loosen my motor mount bolts that connect to the k-member and there you go.......

  2. #22
    King 0f n00bz shady milkman's Avatar
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    i thought you could drop the whole front assembly ..motor to K and front suspension

  3. #23
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by shady milkman View Post
    i thought you could drop the whole front assembly ..motor to K and front suspension
    yes you can, but you have to hang the motor and drop the K member down fartge to get the pan out. in the GTO the pan wraps around the K member

  4. #24
    Member jb3golf's Avatar
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    Thumbs up

    Yep. He's right on that. You have to do it this way or else you cannot create the spacial separation needed to remove the oil pan......

  5. #25
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    Quote Originally Posted by jb3golf View Post
    Yep. He's right on that. You have to do it this way or else you cannot create the spacial separation needed to remove the oil pan......
    oops yea..i forgot ..your dropping the pan too ..my bad.

  6. #26
    Member jb3golf's Avatar
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    Yep. No worries. I just hope the install goes well and the engine will be more capable of higher RPM's and more reliable.

  7. #27
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by jb3golf View Post
    Yep. No worries. I just hope the install goes well and the engine will be more capable of higher RPM's and more reliable.
    oh it will....it will

  8. #28
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    1978 280z- ls1-v8

    Hey Mark. You said that you will be spinning upto if not over 7000 rpms. What lifters will you be using?

  9. #29
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by scubamark3995 View Post
    Hey Mark. You said that you will be spinning upto if not over 7000 rpms. What lifters will you be using?
    I went with the Ls7 lifters, they replaced the ls1s......so now even if you order ls1 lifters you will get the ls7s.........if you have an ls1 and ls7 lifter sitting side by side you can see the difference in how they are built and how much beefier the 7s are.....
    I have pics and will try to get them posted

  10. #30
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    1978 280z- ls1-v8

    Is the ls 7 lifter heavier? will the extra wieght cause the float ? Or is it purely the pump up effect on the old style lifters that cause the valves to stay open. Or maybe a combination?

  11. #31
    cutting and welding mark21742's Avatar
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    the ls7 is on the left

  12. #32
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    1978 280z- ls1-v8

    Looks like the oil hole is smaller. That would hopefuly mean no lifter plunger pump up.

  13. #33
    cutting and welding mark21742's Avatar
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    Quote Originally Posted by scubamark3995 View Post
    Looks like the oil hole is smaller. That would hopefuly mean no lifter plunger pump up.
    the lifter also wraps all the way around the roller to keep flex down and the oil hole was moved about 90

  14. #34
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    1978 280z- ls1-v8

    I wonder if the ls7 will work with bigger cam lobes? I have a duration of 247 and a lift of .624 at the valve.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by scubamark3995 View Post
    I wonder if the ls7 will work with bigger cam lobes? I have a duration of 247 and a lift of .624 at the valve.
    it rides on the top center of thr highest part of the lobe so you should have no problems......it does look like it would hit lol
    I'm runnig a 236/242 .595/.595 112lsa cam in mine and it easily clears

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    1978 280z- ls1-v8

    I just got off the phone with Mike at "G" Force in Friendswood, Texas. Good news. He said with the springs that come with the trick flow heads will work fine with the ls1 lifters. He said I should be able to run plenty of rpm. He is gestimating close to 600 hp at the crank. He thinks the car might get into the nines all motor. We were guessing 560 hp at the crank and about 460 at the wheels. I was guessing about a 10.50 et. The car is going to wiegh in around 2900 lbs.

  17. #37
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by scubamark3995 View Post
    I just got off the phone with Mike at "G" Force in Friendswood, Texas. Good news. He said with the springs that come with the trick flow heads will work fine with the ls1 lifters. He said I should be able to run plenty of rpm. He is gestimating close to 600 hp at the crank. He thinks the car might get into the nines all motor. We were guessing 560 hp at the crank and about 460 at the wheels. I was guessing about a 10.50 et. The car is going to wiegh in around 2900 lbs.
    i think you will be closer in your estimate then mike

  18. #38
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    1978 280z- ls1-v8

    I was just looking at houston raceway parks schedule for next year. Pinks-all-out will be there oct 15th and 16th.
    Last edited by scubamark3995; 12-18-2009 at 03:01 PM.

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