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Old 04-26-2014, 08:03 PM
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Default lifter preload
building an lq9 with 243 heads, hr288 comp cam, ls7 lifters. what lifter preload does every one prefer? .050? measured push rod length today and came up with 7.300. what push rod should I get?

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Old 04-26-2014, 08:24 PM
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Although 0.050" or even a little less will work, based on the threads here that I've read, I believe the recommendations for preloads on the LS7 lifter run from 0.060" to 0.100" with 0.080" being a popular target.
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Old 04-27-2014, 11:29 AM
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I went with ~.080" for preload on my LS7 lifters.
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Old 04-27-2014, 05:51 PM
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I have around .080" on mine as well and the valvetrain is very quiet
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Old 04-27-2014, 10:09 PM
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Originally Posted by tom70
building an lq9 with 243 heads, hr288 comp cam, ls7 lifters. what lifter preload does every one prefer? .050? measured push rod length today and came up with 7.300. what push rod should I get?

thanks
That's a pretty short pushrod. Are the heads milled or using a thinner head gasket?
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Old 04-28-2014, 08:44 AM
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Could you clarify the 7.300 measurement?
Was that actual measurement not taking pre-load into account?
If so get at least 3.375 or 7.400 will work.
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