Stock ls1 lifter preload??

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Jul 24, 2010 | 05:32 PM

Fastdriver1992

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Stock ls1 lifter preload??

I'm installing a 230/236 540/540 110 cam in a 04 gro with an 03 block with stock ls6 heads. The stock ls1 pushrods r a bit long. How much can I preload the lifers. I want to be safe.

If I didn't mention anything aftermarket then it's stock

Thanks

Anthony

Jul 25, 2010 | 02:17 AM

sayed_000

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From: Bahrain - middile east

i have as same as your cam numbers except am in 112+2 custom grind

running stock lifters with no problem but little noisy ..

Jul 26, 2010 | 03:34 PM

Taspeed

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something like .030 is stock. any more than that and you will get nasty valvetrain noise and collapsed lifters.

Jul 26, 2010 | 06:26 PM

LS1MCSS

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Quote:

Originally Posted by Taspeed

something like .030 is stock. any more than that and you will get nasty valvetrain noise and collapsed lifters.

That's incorrect. A lot of people run close to .100. I have my preload at .085 and I don't have any valve train noise. The noise come from less preload.

Jul 26, 2010 | 06:32 PM

SladeX

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Stock lifter's should be 0.060 preload as I recall. LS7 lifter's can handle a bit more.

I've never had my car so quiet out front as I did this weekend getting proper preload on my lifters. You have to strain to hear lifter noise over the exhaust note of my car now.

Jul 26, 2010 | 08:00 PM

LS-1Z28

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manufacturer suggested preload is 0.05'' - 0.08''

some people go as much as 0.10'' preload. I went with 0.06'' and I haven't had any problems.

Jul 26, 2010 | 08:33 PM

jerflash

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From: long island, ny

i went .080 on some ls7 lifters and its perfect

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Jul 27, 2010 | 11:49 AM

SladeX

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Pre-load varies with lifters.

Stock LS1's were 0.050 to 0.080 with 0.06 as ideal.

The LS7 lifters were a little taller in the cup allowing a bit more pre-load to be used.

Running more is not necessarily quieter. I ran 0.09~ and had terrible lifter noise on long cruises and at the end of 1/4 mile runs. I started with 0.08 as recommended by a vendor, went to 7.4 (0.09~ preload), now backed down to 7.375 now with ~0.07 preload.

Valvetrain is near silent now.