ls7 lifters?
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
i have heard of people having problems with those lifters. dont remeber exactly what the deal was but why not just get a push-rod length checker to be sure??
I know this for a fact....
You can use LS7 lifters, but the pushrod cup sits 50 thousands higher than LS1/6 units requiring a 50thousands shorter pushrod to maintain proper preload.
I'd post the link, but this i-phone doesn't let me copy and paste.
If you go to www.corvetteforum.com and look in the c5 tech you will find thread on the 1st or 2nd page. It has "LS7 lifter" in the title.. Pic included!
You can use LS7 lifters, but the pushrod cup sits 50 thousands higher than LS1/6 units requiring a 50thousands shorter pushrod to maintain proper preload.
I'd post the link, but this i-phone doesn't let me copy and paste.
If you go to www.corvetteforum.com and look in the c5 tech you will find thread on the 1st or 2nd page. It has "LS7 lifter" in the title.. Pic included!
Gotta measure! There are differences in block deck height, cylinder head machining, base circle size, plunger height in the lifter, and more from one engine to the next.
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I'm talking about THIS particular LS1 engine that simply swaps lifters with an identical GM head gasket..... the LS7 pluger is going to be 50thousands higher than the LS1 lifters that came out.
Not talking about milling heads, decking a block, swapping heads, changing head gasket brands.... I'm just referring to the plunger cup height from an LS7 compared to an LS1 lifter.
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Verdad Gallardo ^ Totally true.... but I'm referring to the lifter itself.
I'm talking about THIS particular LS1 engine that simply swaps lifters with an identical GM head gasket..... the LS7 pluger is going to be 50thousands higher than the LS1 lifters that came out.
Not talking about milling heads, decking a block, swapping heads, changing head gasket brands.... I'm just referring to the plunger cup height from an LS7 compared to an LS1 lifter.
I'm talking about THIS particular LS1 engine that simply swaps lifters with an identical GM head gasket..... the LS7 pluger is going to be 50thousands higher than the LS1 lifters that came out.
Not talking about milling heads, decking a block, swapping heads, changing head gasket brands.... I'm just referring to the plunger cup height from an LS7 compared to an LS1 lifter.
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sorry to bring this old thread back to life but what exactly is an (LS7) lifter? What i mean is i just got some (LS7) lifters from sdpc. They are acdelco and on acdelcos website they list the same part number for the LS1 all the way threw the LS9. ??? So what exactly is an LS7 lifter?? (part number)
I know you work for/own a shop, and I mean no disrespect but you are incorrect to make that general statement.
9/10 times, an LS7 will require a slightly shorter pushrod due to being ~.050-.060 tall in the cup. I did a setup a 3 months ago w/ LS7 lifters, heads decked .015, cam motion cam and it took a 7.325 pushrod.
Only way to know, is measure. PERIOD. There is no guess work in checking lifter preload & pushrod length........if you want to do it right that is.
9/10 times, an LS7 will require a slightly shorter pushrod due to being ~.050-.060 tall in the cup. I did a setup a 3 months ago w/ LS7 lifters, heads decked .015, cam motion cam and it took a 7.325 pushrod.
Only way to know, is measure. PERIOD. There is no guess work in checking lifter preload & pushrod length........if you want to do it right that is.
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
First, let me say I 100% agree with the "measuring no matter what" idea. Its better to do it right then to be sorry later. However, I have been reading the threads pertaining to this particular lifter as I myself recently purchased a set. The rationale was that GM designed it as a stock lifter replacement for the LS1 therefor meaning it could be used in that application in its stock form with no issues. Now, the cup is .050 taller, I have seen the side by side of the original LS1 and the new LS7 lifter. I believe it was a post by TSP that stated there is a certain amount of self-adjustability of this lifter to enable it to work where, it is in fact .050 longer then the lifter its replacing. That seems reasonable to me. There are opponents on both sides of the fence on this one. Bottom line, measure 
Refer above 
sorry to bring this old thread back to life but what exactly is an (LS7) lifter? What i mean is i just got some (LS7) lifters from sdpc. They are acdelco and on acdelcos website they list the same part number for the LS1 all the way threw the LS9. ??? So what exactly is an LS7 lifter?? (part number)
