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comp r lifters

This is a discussion on comp r lifters within the Internal Engine forums, part of the LSx Technical Help Section category; ok im running comp r lifters anyone know the proper backlash to run with them or how tight to get ...

  1. #1
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    comp r lifters

    ok im running comp r lifters anyone know the proper backlash to run with them or how tight to get the rockers....... any help would be appreciated

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    408 motor n/a

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    Suppose to be around 0.003 (3 thousandths) hot.

    I set mine to 0.015 (15 thousandths) cold.

    Adjustable rockers are a must.

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    408 ci + 4000 stall = fun lancesT/A's Avatar
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    Quote Originally Posted by KP1 View Post
    Suppose to be around 0.003 (3 thousandths) hot.

    I set mine to 0.015 (15 thousandths) cold.

    Adjustable rockers are a must.
    i have stock rockers.... should i just run the ls7 lifters instead

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    Yes. That's a good lifter for nonadjustable rockers. Make sure you get your lifter preload where you need it with the proper length push rod.

  6. #6
    408 ci + 4000 stall = fun lancesT/A's Avatar
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    thanks because i ve been having problems with getting oil to my heads and i was told the comp r's are very specific... with non milled heads and ls7 lifters and stock rockers my hardened 7.4 pushrods should be good i think

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    If you're having problems getting oil up top, are you sure the barbell that goes in the oil galley in the rear of the block is installed correctly?

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    well the block is from rpm in dallas but barbell?? i have no idea to be honest... the oil pressure was 65psi at idle... motor is completely out of car (again) so i could figure out the whole issue..... i know the "dogbone" plug is in properly

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    Same thing. That part was updated, but as I recall, it was to reduce oil to the top.

  10. #10
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    so should i take it out???

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    Well, come to think of it, if you've got good oil pressure, but no oil/not enough oil to the lifters & top of the engine, that could be an issue with cam bearing hole(s) not correctly lined up in the block.

    But, anyhow, the plastic piece in the rear engine galley comes out easy enough. Can't see what it would harm to check it & make sure the o ring is good.

  12. #12
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    u have any pics of this plastic piece or o ring bc the only o ring im aware of is the one on the oil pump..... now granted im learning as i go.... but i basically took the back pieces off my ls1 block and moved them over to the 408..

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    oh u mean take out the plug and check it?? how can i tell if my cam bearing are ligned up properly... i thought maybe it was a lifter issue but i guess the cam bearings make sense

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    I don't know exactly what is causeing your oiling issue, just trying to help find it by tossing cam bearings out as a possibility. Only way I know to check the cam bearings is to pull the cam. If you have a video scope you can check it with that.

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    i appreciate the ideas and im gonna pull the cam out over the coarse of the nxt week. i got a buddy that runs a performance shop in austin so il prolly take it to him for help...... thanks again

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    Hope You get it fixed up. This stuff can get frustrating sometimes.

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