Cam time-possible DoD failure

[DirtyBlackHD]

Who failed ls7's?
I run new LS7's in my ls7. If they survive my engine they will comfortably survive yours. Morels are good, but i dont think you will notice a difference unless you have very high lift/aggressive ramp cam and go with larger lifter wheels. Your money would be better spent on fresh rockers if yours are high mile. Avoid the comp trunion kit. Other money well spent is high quality (PSI1511)valve springs and retainers(ti) as i said earlier. I dont think your redline is 6600... If you want to turn that high you need lighter valvetrain that i mentioned, as referenced in my superchevy article.

 

[Jared]

I plan on running btr springs and ti retainers since they have a good following. As far as lifters, it's an easy google search. I've read a few threads on failures and it's been discussed on the fb pages. I don't know full details of every issue. Lately it seems more people have had issues. Not sure if those are delco or delphi, but I'd assume they are equal in quality as they typically are pretty much the exact same.

 

[Jared]

I think the gt is 6k, and the gxp is 6600, not certain.

 

[2005_Silverado]

jesse, billy, lindz, myself are running LS7s....no issues u gotta check the lifters to make sure they spin freely before u slap them on. The variables when it comes to install are too much to generalize and say that the lifters are junk. Youre gonna buy whatever ur gonna buy, but keep in mind theres lots of shit that can go wrong in a build.

I wouldn't be surprised GM would no longer offer say LM7 lifters and instead uses LS7 as replacements.

 

[Jared]

I'm here for a good discussion...to learn and ask questions.

This will be my first cam swap, I'd like to do it right the first time, but not over do it either. I'd rather not go all out since it is a dd, and I plan on keeping it that way for now. I however have no intentions on making it like the truck and taking the long route to get where I want it to be.

I will have a cam spec'd. Still debating from where. Pat will be tuning for sure, so I may see what deal I can get for a cam and efi live and tune. Still not sure on a stall. A part of me wants to leave it alone. New ported oil pump. Leaving intake alone, possibly milling heads and doing ls3 valves, but then again I may leave them alone. I still have to budget it new headers.

I've heard guys running the ctsvr lifters but they seem to be hit or miss, and noisy from what I remember. It's weird, you ask some and they say ls7 is fine, ask the next group and they talk about failures. Whether it's from install error or just a failed part, I don't know. I'm just trying to get the necessary info before purchasing.

 

[Khaos]

The reason you hear about more LS7 failures than others is because of the sheer number of people that use them. Obviously you'll hear more reported failures if there are more people using a specific part

 

[2005_Silverado]

IIRC the ctsv lifters are slow release and not needed for a DD setup....plus

Careful with high psi or high volume pumps...they can put out quite a bit more and u can either run too much PSI or too much volume. For a DD, Id port the oem and add a tiny shim to the oem spring to bump up the psi a bit...the mild porting will drop some of that psi increase from the shim. Milling is cheap and pretty much free HP...do it. You have to get new PRs anyways, might as well get some HP out where u can. IDK the diff between ur current valves and LS3s? If lighter, Id do it if reasonably priced.

 

[Jared]

Some suggest the hollow ls3. I have read around .025 and .030 mill to bump compression. It's probably around $100 or so. I really need to tear it down, or rather yank the cover and start getting a better idea. My work schedule makes it hard. Saturday I will begin messing around with it. I'll be out of town all next week. Once I get back I'm sending my vms cable off to be linked to my vin so I can remove their shitty tune. Sucks I have to pay someone $150 just to take their junk off.

 

[DirtyBlackHD]

Ls3 are hollow stem, a good upgrade to turn rpm, but those dual springs arent so it may be a waste, esp if the cam is weak.
Cadillac lifters are not for you. They can have issues and really need an endurance cam

 

[Jared]

What are you considering weak? Recommendation on springs for that setup?

 

[DirtyBlackHD]

I should have said, if the combo runs out of hp before 6100rpm....then theres no big need for a 6600rpm stable valvetrain. Springs ive said like 8 times with an article link. Psi1511ml

- - - - - - - - - -auto merged double post- - - - - - - - - -

Worth a read if you increase valvetrain weight and want to turn rpm http://www.superchevy.com/how-to/14...n-stability-ls7-exhaust-valves/#ixzz3Ce45USBo

....

 

[Jared]

I gotcha, I always assumed the dual spring was a better option as well based off the fact they are always recommended. I agree, why not just make something that won't break.

 

[Samuel6731]

ls7 lifters here FTW zero issues.

 

[Charlie]

subbing

 

[2005_Silverado]

ls7 lifters here FTW zero issues.

but he read on some forum about some guy who he doesn't know that knows a guy who had a lifter give out

 

[Samuel6731]

iv heard and read about them.. but seems it was a bad batch at that time or something. I havent heard about them failing lately.

We gonna see how tuff these are when it goes 7000 rpms here soon

 

[2005_Silverado]

LS7s already turn 7k stock nothing new to push them that high

 

[Samuel6731]

not with over 600 lift and under pressure from a dual spring.

Regardless i shouldnt have issues, prob break something in the bottom end first but 5.3 short blocks here are cheap

 

[ShredSled]

Who failed ls7's?
I run new LS7's in my ls7. If they survive my engine they will comfortably survive yours. Morels are good, but i dont think you will notice a difference unless you have very high lift/aggressive ramp cam and go with larger lifter wheels. Your money would be better spent on fresh rockers if yours are high mile. Avoid the comp trunion kit. Other money well spent is high quality (PSI1511)valve springs and retainers(ti) as i said earlier. I dont think your redline is 6600... If you want to turn that high you need lighter valvetrain that i mentioned, as referenced in my superchevy article.

Just curious why you say avoid trunnion mod???!

I know dozens of people around here, including myself on two engines, who have been running it.



Oh and ls7 lifters are the standard go to. High rate of failure, what?
PSI springs are solid too; what Katech specs on all their endurance motors.

 

[Samuel6731]

sorry to bump the old, but yes curious as why no trunion?

I have them in my truck since i plan to rev really high. They seemed like a nice kit for the price and worth the piece of mind.