Another internet myth bites the dust... LS7 vs. LS1 lifters
06-02-2011, 06:59 PM
#1
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Another internet myth bites the dust... LS7 vs. LS1 lifters Ok, so after having hundreds of customers calling me asking about pushrod length with LS7 lifter, I have finally decided to stop everthing today and take some actual measurments of the 2 lifters...
First of all, I already knew this was a myth based on actual preload measurments I've taken over the years since the "LS7" lifter came out. Secondly, since GM has superseded the LS1 lifter with the LS7 lifter I knew they wouldn't have been able to do that without making a pushrod length change as well...
If you take a look at each lifter from the pushrod side, the LS7 pushrod cup appears to be approximately .025" higher in the lifter body. HOWEVER, if you take the actual measurment that matters which is the distance from the tip of the roller to the base of the pushrod cup, the lifters are virtually identical. Overall, the LS7 lifter body is slightly shorter overall vs. the LS1 lifter hence the illusion of pushrod cup difference.
I hope this helps end the debate. If anyone is interested in performing this measurment I would greatly appreciate it so that I will have some outside verification of my measurments.
Thanks for reading.
Shane
First of all, I already knew this was a myth based on actual preload measurments I've taken over the years since the "LS7" lifter came out. Secondly, since GM has superseded the LS1 lifter with the LS7 lifter I knew they wouldn't have been able to do that without making a pushrod length change as well...
If you take a look at each lifter from the pushrod side, the LS7 pushrod cup appears to be approximately .025" higher in the lifter body. HOWEVER, if you take the actual measurment that matters which is the distance from the tip of the roller to the base of the pushrod cup, the lifters are virtually identical. Overall, the LS7 lifter body is slightly shorter overall vs. the LS1 lifter hence the illusion of pushrod cup difference.
I hope this helps end the debate. If anyone is interested in performing this measurment I would greatly appreciate it so that I will have some outside verification of my measurments.
Thanks for reading.
Shane
Last edited by XtraCajunSS; 06-02-2011 at 07:09 PM.
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06-03-2011, 05:10 AM
#9
You are correct. We have someone on another forum I belong to that works for GM and he has stated for years installation requirements remain the same. It only makes sense otherwise they would have had to issue TSB's for lifter replacement specifying different pushrods plus later motors would have had to have new parts, which means more logistics to keep different parts in stock, etc.
06-03-2011, 02:15 PM
#14
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Thanks, Guys. I've always known it was a myth because I check lifter preload on every cam swap I do. The results have always told me the pushrod cups had to be the same distance from the camshaft. Its just that no one ever wanted to believe me! I guess 100+ cams swaps a year don't count for much when you're trying to make appropriate component recommendations...
Shane
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06-03-2011, 02:22 PM
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so what i'm still confused about is where the "0.025" came from? was that just people eye-balling that picture we've all seen of the two lifters side-by-side? Or did someone actually take a measurement once? maybe they took it from the top edge of the lifter to the cup vs. the correct measurement from the tangent of the roller to the cup?
06-03-2011, 02:33 PM
#17
Finally someone smashed this officially. I have been running the LS7's since they first started replacing the LS1's with them. When I did my cam swap I just used the same length pushrod you would have ordered for stock LS1 lifters & have never had a issue, never measured & its got almost 70k miles on the combo.
06-21-2011, 06:38 PM
#19
Ok, so after having hundreds of customers calling me asking about pushrod length with LS7 lifter, I have finally decided to stop everthing today and take some actual measurments of the 2 lifters...
First of all, I already knew this was a myth based on actual preload measurments I've taken over the years since the "LS7" lifter came out. Secondly, since GM has superseded the LS1 lifter with the LS7 lifter I knew they wouldn't have been able to do that without making a pushrod length change as well...
If you take a look at each lifter from the pushrod side, the LS7 pushrod cup appears to be approximately .025" higher in the lifter body. HOWEVER, if you take the actual measurment that matters which is the distance from the tip of the roller to the base of the pushrod cup, the lifters are virtually identical. Overall, the LS7 lifter body is slightly shorter overall vs. the LS1 lifter hence the illusion of pushrod cup difference.
I hope this helps end the debate. If anyone is interested in performing this measurment I would greatly appreciate it so that I will have some outside verification of my measurments.
Thanks for reading.
Shane
First of all, I already knew this was a myth based on actual preload measurments I've taken over the years since the "LS7" lifter came out. Secondly, since GM has superseded the LS1 lifter with the LS7 lifter I knew they wouldn't have been able to do that without making a pushrod length change as well...
If you take a look at each lifter from the pushrod side, the LS7 pushrod cup appears to be approximately .025" higher in the lifter body. HOWEVER, if you take the actual measurment that matters which is the distance from the tip of the roller to the base of the pushrod cup, the lifters are virtually identical. Overall, the LS7 lifter body is slightly shorter overall vs. the LS1 lifter hence the illusion of pushrod cup difference.
I hope this helps end the debate. If anyone is interested in performing this measurment I would greatly appreciate it so that I will have some outside verification of my measurments.
Thanks for reading.
Shane
https://ls1tech.com/forums/generatio...size-vids.html
Any help?
06-21-2011, 08:51 PM
#20
And by people who seem very smart over TEH INTARWEBZ too...
No way. You must be doing this comment by deduction not by actualy measuring roller to inside cup area (where p-rod tip lies).
You have nothing stock to point to that. AFR heads, comp cam and YT rockers. All of which will never give you a deduction on your comments.
It is .050 taller at the cup period (actual measurement)
You have nothing stock to point to that. AFR heads, comp cam and YT rockers. All of which will never give you a deduction on your comments.
It is .050 taller at the cup period (actual measurement)