Are shorter pushrods required with LS7 lifters?
Are shorter pushrods required with LS7 lifters? I have all parts ready to do a H/C swap, the last thing I bought are the LS7 lifters.
Thanks to PREDATOR-Z I have the combination setup for a nice swap.
I have 7.40 pushrods which is the correct length for the stock LS1 lifters with my combo, reading a few threads I'm seeing that I might need to go with .50 shorter pushrods if using the LS7 lifters, is this confirmed?
I would need to use 7.350 pushrods instead of 7.4, or should I get a pushrod checker and measure while doing the H/C swap?
Thanks to PREDATOR-Z I have the combination setup for a nice swap.
I have 7.40 pushrods which is the correct length for the stock LS1 lifters with my combo, reading a few threads I'm seeing that I might need to go with .50 shorter pushrods if using the LS7 lifters, is this confirmed?
I would need to use 7.350 pushrods instead of 7.4, or should I get a pushrod checker and measure while doing the H/C swap?
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Well on 2 threads with poeple using LS7 lifters, I've noticed that after measuring, they end up using shorter push rods than if old LS1 lifters were used.
I haven't been able to confirm that indeed the LS7 lifter dimentions, from roller to cup is perhaps .050 taller VS OEM lifters.
I haven't been able to confirm that indeed the LS7 lifter dimentions, from roller to cup is perhaps .050 taller VS OEM lifters.
Man I really need to know this also. I got a set of 7.4 pushrods for my combo thats supposed to work. But I'm also gonna be runnin 5.3 heads milled .030 with FelPro gaskets that are .041 compressed.
I got the 7.4's under the impression that they will work fine. It sucks for me cause I can't really have any down time except the 2 days we are gonna work on the car over a weekend. And I don't have the money to buy 3-4 sets of pushrods just in case the 7.4's aren't right. So I'm tryin to research everything & match the right parts together the first time so we can just install it & be done.
I got the 7.4's under the impression that they will work fine. It sucks for me cause I can't really have any down time except the 2 days we are gonna work on the car over a weekend. And I don't have the money to buy 3-4 sets of pushrods just in case the 7.4's aren't right. So I'm tryin to research everything & match the right parts together the first time so we can just install it & be done.
I have LS7 lifters with my combo (FMS13, LS6 heads, .040 Gasket and 7.400 pushrods) and it has quite a bit of ticking noises when warm but quite while cold. I order a pushrod length checker but I believe that the pushrod are too long.
TECH Senior Member
Joined: Mar 2004
Posts: 14,620
Likes: 17
From: BFE
Originally Posted by warp10
I have LS7 lifters with my combo (FMS13, LS6 heads, .040 Gasket and 7.400 pushrods) and it has quite a bit of ticking noises when warm but quite while cold. I order a pushrod length checker but I believe that the pushrod are too long.
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Maybe some sponsors that sell these on here could grab some & find out for us?? Possibly also anwser some of these questions as they are startin to pop up now since people started using them more recently??
I for one am very interested since this could be the only part of my build to affect pushrod length.
I for one am very interested since this could be the only part of my build to affect pushrod length.
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well the LS7 Lifter is the replacement for the ls1, so they technically they should be the same length according to gm. That doesnt mean that they dont need a different length push rod. GM with their infinate wisdom has been known in the past to replace parts and forget to mention needing additional parts to make the replacement work.
Installed LS7 lifters in my 408 with 7.40 pushrods and stock rockers. No problems, no noise, rockers are showing centered with good geometry. I would say no, the 7.40 pushrods will be fine.
I used the LS7 lifters w/ an MS4 cam and 7.4 PR's. Stock heads and gaskets. It did have a bit of a tick when warm, but it was quieter than the TR230/stock lifters it replaced.
I just installed AFR 205's milled .030 with a TR224 cam, LS7 lifters & 7.4 pushrods. 
I am curious now too, I'm about to install the LS7 lifters in my LS1 with a F13 cam and unmilled Dart 205 heads. I have a set of 7.400" pushrods and want to do it right the first time.
Do it right and buy a pushrod length checking tool. I can't believe some of you guys are not worried about your motors ticking at warm idle! Did your stock motor tick?
There's only one way to do it right.
There's only one way to do it right.
Originally Posted by Bandit LS1
I am curious now too, I'm about to install the LS7 lifters in my LS1 with a F13 cam and unmilled Dart 205 heads. I have a set of 7.400" pushrods and want to do it right the first time.
Originally Posted by Ryan02SS
Do it right and buy a pushrod length checking tool. I can't believe some of you guys are not worried about your motors ticking at warm idle! Did your stock motor tick?
There's only one way to do it right.
There's only one way to do it right.
Yes my stock motor did tick. It was quieter w/ the LS7 lifters than it was before(stock/previous setup). But I do agree with the push length checker. I just brought the rockers to zero lash and verified that I had between 1 & 1 1/2 turns of preload. While this may not the best method or most the professional, at least I can say it was close.
Originally Posted by Ryan02SS
Do it right and buy a pushrod length checking tool. I can't believe some of you guys are not worried about your motors ticking at warm idle! Did your stock motor tick?
There's only one way to do it right.
There's only one way to do it right.
brian
I am running 7.4 pushrods with my LS7 lifters, MS4, and Stage 1 PRC heads. Sounds like a sewing machine. As far as ticks go I can't say it's any worse than stock. I've heard of other people using shorter pushrods so I ordered the length checker and it came out that 7.4's worked best for me even with the different base lobes between exhaust and intake.