fccs

iTrader: (26)

Alright while my car is apart now im thinking of changing the lifters. Heres the details, It's only a mild cam (tsp 228r with 112lsa) I got the tsp pushrods and prc springs, ls6 oil pump, and ls2 timing chain.. My car is a 1998 trans am 6speed with now 95k miles, the oil is changed every 3-4k with ams oil. Should I bother getting ls7 lifters or are the ls1 lifters fine since there both roller lifters to begin with..

2000NavyZ

iTrader: (8)

put the new lifters in it, they are only like 130$ and its peace of mind. and you cannot put a price on that!

99blancoSS

iTrader: (115)

new lifters please, cheap insurance IIRC GM recommends to check/swap them at 100k anyway

NateLS1

iTrader: (4)

Aren't the LS7 lifters slightly larger? So that would throw your geometry off, you might have to get shorter pushrods.

I may be wrong but I would definitely check before putting them in.

fccs

iTrader: (26)

Yea this is one of the things I wanted to know also..

TooLateVTEC

iTrader: (2)

New lifters for sure !

If you dont, your just taking the pin outta the grenade.

2002 SS HUGG

Yes, you are correct. The LS7 lifters are about .050 longer than the stock LS1 lifters. This difference will result in you needing to use around a 7.35 pushrod. The (-.050) in pushrod length should bring you close or in ballpark to stock preload. However, I must stress the use of a pushrod length checker to make sure you are using the right size pushrod and a safe preload on the lifters.

To further this, I have researched and done various searches and found that optimum preload on the LS7 lifters is between .06 and .090.

Link1: https://ls1tech.com/forums/generatio...066-091-a.html

Link2: Go to post #15 http://forums.corvetteforum.com/c5-t...rs-in-ls1.html

The purpose of link #2 is to show how hard it can be, the various answers you can get and how you have to find what application works best for you. This is why I stress the use of a pushrod length checker to help with install.

Now, on a side note, there are many theorists and builders that can argue their case on what amount of preload to use to maximize power, or safety either using lower (.030) or higher (.120) preload. But, I would rather have an engine with a comfortable or relatively stock preload, that runs a quiet valvetrain than one that necessarily produces the most horsepower. I hope this infor can be of some assistance.

Summerwolf

iTrader: (3)

New lifters are cheap insurance, put them in....

LCplmarine98

iTrader: (9)

Good thread i am also doin a H/C swap and wondering about the LS7 lifters. I have also heard about gettin the bearing upgrade on the rockers by harland sharp. It costs about 230 to get it done is it worth it?

LilJayV10

iTrader: (39)

I would also look into getting the LS2 lifter trays. They are suppose to be stronger. Thunder Racing sells them and they aren't to expensive.

As far as the lifters I had the same question. I have 44,xxx on my car. Predator Z suggested the lifter trays and checking the lifters.

Summerwolf

iTrader: (3)

YES....I bought new Yella Terra rockers but have my stock ones here. If you want a set of nice 2004 rockers I'll sell them cheap so you can send mine off to harland sharp for the rebuild with no downtime.

DVS99TRANS

iTrader: (7)

LS7 lifters FTMFW!!!

2002 SS HUGG

I have continued my research and found that some people have actually had some problems with the re-built Harland sharp rockers (with the bearings going bad). Here is the link to my findings:

https://ls1tech.com/forums/generatio...cs-inside.html

Now, this is only for the re-built Harland Sharp rockers. I have not found any (from my research or knowledge) of people having issues with the aftermarket HS rockers. Of course, we all know how trying to find fallible information on this site can be stressing, time consuming, but I try my best to help others.

Now LCplmarine98, if you were considering the bearing upgrade from Harland Sharp, I would just recommend spending the extra $100 on a aftermarket set of rockers (Yella Terra, Harland Sharp, even Scorpion). Of course, I have not been informed on what your h/c set up will be, but I feel you would have extra security and better peace of mind with actual aftermarket/new rockers. The only other question if you decide to go with aftermarket rockers is, non-adjustable or adjustable and what ratio you want to use.

LCplmarine98

iTrader: (9)

My cam and heads are in my sig, Thunder suggests not using 1.8 rockers so i figured i would stick with the factory 1.7. As far as adjustable or non adj. what exactly does that mean what do you adjust, and its not like a SBC where you have to get the feeler gauge out and adjust the backlash. Also when people talk about pre-loading the lifters what does that mean and how is it done?

intake68

iTrader: (5)

For what it matters I run the same cam on AFR205's milled to 60cc on a .045 cometic with LS7 lifters. I use a 7.350 pushrod and that gave me .080 preload.

Are you running the stock heads??? If so best measure if you do go with LS7 lifters so that you get preload correct.

But yes DO change the lifters regardless of LS7 or Comp or Morel IMO.

LCplmarine98

iTrader: (9)

I will be runnin LS2 243s with gm head gaskets, I will be using LS7 lifters. I guess the best thing to do is use a pushrod length checker insted of spending grips of money on PRs.

NAAllTheWay

id say the ls1 ones are fine man, but still not a bad idea to go with cheap insurance

LCplmarine98

iTrader: (9)

For sure I am spending alot of money doing this swap right the first time and i want to do everything i can to make it as reliable as possible.

2002 SS HUGG

Alright, I hit the research room again and found a PDF done by Lunati. It is an installation guide for their aftermarket lifters, here it is:

http://www.google.com/url?sa=t&sourc...0FZRMm44LFUwpQ


If the PDF does not work, here is the HTML. However, the font is very small:
http://74.125.47.132/search?q=cache:...&ct=clnk&gl=us


Within the PDF, we find that they recommend engines with non-adjustable rockers to have a lifter preload between .020 and .060. Take into consideration, these are Lunati lifters, not LS7 lifters. This means, their suggested preload may not necessarily apply to the LS7 lifters. Like I said before, the optimum range/preload for the GM LS7 lifters is between .060 and .090.

However, this read will help explain what lifter preload is for you LCplmarine. This PDF does a pretty good job explaining how to properly install new hydraulic lifters, while at the same time, explaining the engineering and purpose of preload and how hydraulic lifters operate. Again, I hope this may answer some of your questions to lifter preload, what it is and how to properly install.

As for your question behind adjustable and non-adjustable, I found a link to comp cams installation of their lifters:
http://www.google.com/url?sa=t&sourc...v6sxN54_MPeITg

Here is the HTML if the PDF does not work:

http://74.125.95.132/search?q=cache:...&ct=clnk&gl=us

Again, the HTML font will be small.

Now, on Page 3 it talks briefly about adjustable rocker arms and how to set preload on them.

I really do hope people can use this information. My apologies for the long posts as well guys.

LCplmarine98

iTrader: (9)

Thanks for all the info.