Comp 850-16 lifters.
Are they reliable to 7000rpm?

 

No one knows?

 

whether they are or are not i have not had a lifter failure from spinning to 6600RPM on my 130k mile stock bottom end or with my 3k mile stock bottom end. if your oil pressure is good then i think the only thing you stand to loose is a rod or a spring failure. FYI the 130k mile motor used NON hardened pushrods with the factory self aligning rockers which was stupid and the 3k mile motor has hardened pushrods, dart valve springs with dampener, NSA roller rockers and guide plates.

 

dunno about the comp ones but stock replacement ones from gm are

 

stick with gm, comp brand lifters scare me lol

 

LS7s FTW!

 

ls7s will handle 7k with no prob, ftw

 

Yes, I understand that LS7s would have been a good choice.
The situation being that these were installed 3 years / 10K miles ago with a much milder cam.
The new cam will want to see more RPM and I see no reason to replace the lifters,
(they're in great shape) unless they can't handle the job.

 

if they're up to OEM spec, work fine, show no wear/tear then go for it

 

First of all do you need to spin to 7000? or do you think you will be making power to that level.. the only time I have seen LTx need to turn up to 7000+ is BIG SR, BIG Head, Sheetmetal combos...

 

I think they can take it, I'd worry about valve float at that rpm and snapping one. I think you'd bend a pushrod before you collapse a lifter. However, if you're worried about it, go for the LS7s.

 

$125 for a set of LS7s
+ Sell yours for $100
+ not having to ask if they can handle it
= priceless

 

LOL. I'd do that one.

 

HP peaks around 6650, TQ around 5300; have not decided where I will set the shift point until I am done testing/tuning.


My springs (Patriot Gold Extreme) and pushrods (Comp Hi Tech) will be just fine.
Had I know that LS7s fit when I built the motor, I probably would have put them in.
At the time, people were still arguing over the issue.

fixed