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Generation III Internal Engine
lifter preload

Generation III Internal Engine 1997-2006 LS1 | LS6

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lifter preload

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Apr 26, 2014 | 08:03 PM

#1

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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?

thanks

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Apr 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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Apr 27, 2014 | 11:29 AM

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I went with ~.080" for preload on my LS7 lifters.

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Apr 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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Apr 27, 2014 | 10:09 PM

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Quote:

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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Apr 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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