LS7 vs. LS1 lifter length

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Oct 2, 2009 | 05:17 PM

#41

NemeSS

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From: Houston,TX

Oct 2, 2009 | 05:24 PM

#42

muayyadf1

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I meant instead of shooting for 1 1/4 turn I ended up getting 1 and half of a quarter.

I was screwed up of being under the car for most of the day having a lot of fun. You know.

Oct 2, 2009 | 06:37 PM

#43

zacht

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1 1/8????

Oct 2, 2009 | 07:00 PM

#44

mknight759

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From: albany ga

interesting !! how many rpm or hp are the stock open face ls1 lifters rated for mine are new and i was planning on using them do i need to change to the ls7 and new pushrods or will i be ok i will be peaking out about 6200-6400

Oct 2, 2009 | 09:00 PM

#45

XtraCajunSS

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From: Baton Rouge, LA, USA

1 1/8 turns would be fine.

Shane

Oct 3, 2009 | 12:18 AM

#46

muayyadf1

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Thanks Shane,
Regards

Oct 3, 2009 | 12:34 PM

#47

01ssreda4

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From: Turnin' Wrenches Infractions: 005

good thread!!

Oct 4, 2009 | 07:04 PM

#48

XtraCajunSS

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From: Baton Rouge, LA, USA

Quote:

Originally Posted by mknight759

I have used LS7 lifters WELL past 7200 with spring pressures you would not believe. You will be fine...

Shane

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Jan 22, 2010 | 10:17 PM

#49

printmanjackson

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Quote:

Originally Posted by XtraCajunSS

I have used LS7 lifters WELL past 7200 with spring pressures you would not believe. You will be fine...

Shane

how long will they last under those conditions?

Jan 22, 2010 | 11:29 PM

#50

muayyadf1

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I think these lifters are very sensitive to preload. Too much means they will break very soon

Jan 22, 2010 | 11:49 PM

#51

Austinma62

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From: Saint Joseph, MO

Quote:

Originally Posted by muayyadf1

Shane, I tried your method and I ended up being less by half a quarter of 1 1/4 turn.

Should I get worried?

Quote:

Originally Posted by clubber

That is the most screwed up sentence I've ever read. What exactly is a half of a quarter of 1 1/4 turns?

Damn! This had me laughing for a good 5 minutes

Jan 23, 2010 | 12:08 AM

#52

muayyadf1

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Good to know u r good in laughing.

Jan 23, 2010 | 09:05 AM

#53

printmanjackson

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Quote:

Originally Posted by muayyadf1

I think these lifters are very sensitive to preload. Too much means they will break very soon

could this be the reason for some of the LS7 lifter failures here lately?

Apr 9, 2011 | 05:39 PM

#54

indyboom

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From: YOUR MOMS

Quote:

Originally Posted by muayyadf1

Good to know u r good in laughing.

I also laughed. Hooked on U.S. Standard worked for me...

Apr 9, 2011 | 06:37 PM

#55

MyFirstLS1

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From: Orange county, ny

Thanks for that info Shane. Best info I have read on lifters and figuring out pushrod lenth.

Apr 11, 2011 | 09:48 AM

#56

XtraCajunSS

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From: Baton Rouge, LA, USA

Thanks. I have never had a lifter failure in all my years of doing this. The only problems I see with stock type lifters is due to incorrect valvetrain setups leading to instability and lifter guides getting old and failing...

Shane

Mar 10, 2021 | 12:14 PM

#57

Gen2-LT4

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Quote:

Originally Posted by XtraCajunSS

Im usually not a necro bumper but since this thread is very highly ranked in Google I thought I would dig it up. Ive been doing some research as I detected the LS-7 pushrod cup depth myself when using Comp Cams pushrod checkers. I measured it with a micrometer and got 0.060 shallower. I used a different method that im not the originator of but I feel is far more accurate. It is however not something the LS guys will like due to the fact you have to pull the heads on LS motors, unlike SBC's to get to the lifters. This is why I only use it when building a new/custom motor on an engine stand.

But I wont go into further detail on that unless its warranted and would need to be a fresh post.

The reason for the reply here is Cajun's method is sound for one, "critique". The use of the torque wrench I feel only adds inaccuracy and variation between users. Once the rocker is fully seated/mated to the head, any further rotation of the bolt is only adding stretch to the fastener and not affecting lifter pre-load. I feel the procedure would be much more accurate if people simply hand tightened until fully seated.

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