4000 RPM Valvetrain

[Begle1]

What should I do to my valve train to make it good for an occasional 4000 RPM?

Just 60# valve springs?

Or hardened keepers, aftermarket pushrods, custom springs and better-than-stock pedestals and rockers?

What's really required? What would be beneficial?

[KTA]

Good keepers and retainers and 60lb springs will reliably support 4000rpm. The rest of that stuff is optional in my opinion.

[Begle1]

So what are "good" keepers and retainers?

Does "good" mean new Genuine Cummins stuff, or does it mean aftermarket?

[ford69557ci]

i have seen some cummins retainers pull the keeper through on 4000 and up. i think schieds and haisley and several others sell keppers and reatiners that are made for 5000k and up

[KTA]

I meant aftermarket like what Haisley sells.

[Begle1]

Only thing I see on Haisley's website are titanium retainers and hardened keepers for $375.



Them's the ones?
I imagine that those are the same things that 5500 RPM sled pullers run? Was kind of envisioning a mid-level solution.

It's not that big of a job to change out retainers and keepers after I get the head installed, right? Kind of spendy and I probably won't actually have 4000 RPM for at least another year...

[KTA]

$375 is a bargain compared to a dropped valve.

[cummins king]

you got to pay to get good things

[Begle1]

I understand that. It just feels like a waste buying parts good for 6000 RPM and running them at 4000.

I can run up a tab at Haisley's real quick. Keepers and retainers, springs, head gasket and rings...

[cummins king]

well now you have the reasureance that when ur drive shaft brakes and you motor spins to 6000grand its not going to blow up

[Begle1]

I'll probably snap a wrist pin at 5500 and put a rod threw the block. But my valve train and head will be okay, and that'll give me the excuse to put together a bottom end with studs, a girdle and low comp pistons.

[cummins king]

[Fnschlaud4620]

I remember reading someplace that a retainer from a GM Iron Duke and an LS1 spring worked well.

Don't know if it was for a 12v or 24v though

[Begle1]

So what RPM level do you start needing bigger springs?

Somebody told me that I'd see benefits of 100# springs at 4000 RPM.

[ford69557ci]

100 springs would be a little stout maybe some #80. 375 is alot cheaper than new valve piston head gasket and time lol.