blackz97

I guess there is 2 trains of thought (no pun intended).

1. slam the valve closed as soon as possible to minimize pumping losses.

or

2. set the valve down gently so it doesn't bounce off the seat


Option 1 typically makes more power but at the cost of valvetrain stability and longevity. You can regain valvetrain stability with big nasty springs, but your rocker setup better be able to handle it and alas longevity is pretty much non existent.

In the end its all about what you are trying to achieve I suppose.

Innovate

Josh B.

Thanks man. Unreal is just stirring the pot, he has the national debt clock invested into his just like all of us

Innovate

PuckDracon

Sounds like spring fatigue and I would be eager to take Tony's suggestion on getting a few tested to at least eliminate the most likely culprit.

Stinks to spend more money on it but if I were you I would be looking at new beefier springs and true shaft mounts. The ~$1500 or whatever is a drop in the bucket at this point in the build, and the piece of mind in a proper shaft mount setup is priceless. I was recommended to aim for at least 650# open, albeit with a similar sized but more aggressive cam lobe and with true DRE Shaftmounts. It takes a lot to keep an aggressive SR happy at 7500+ RPM

Navy Blue 210

^^^^^^^^^^^^agreed!^^^^^^^^^^^

FRiCK916

Everyone here is cool with "spring fatigue" at 3k miles?

time to change the oil- I mean the valve springs.

right on...

jayyyw

It's possible. Especially with aggressive ramp rates, high lift and sitting compressed for ~1.5 years.

Either way, Josh has repeatedly stated that he will not be investing any time/money into investigating the exact cause. It's a non-issue at this point.

He's much smarter than me in choosing to park the car and tear it down. I continued to drive mine and ALMOST paid the ultimate price. I was lucky and he decided not to chance it.

Millenium Z06

It shouldn't be, that's too often 20k miles is the general norm and I'd even say 15K miles but not 3 and IIRC, the car has been up since may of 17

MTPZ06

Agreed...if the springs are shot with only 3K miles (and not all of those miles are high abuse), then clearly something about his valve train isn't happy. Now if we were talking 15K, I'd say...sounds about right for a "race car".

FRiCK916

Agreed. Yet some are speaking as if this is reasonable and should be expected for a $4-5k cylinder head package.

Unreal

Its all good. No offense meant. I poke fun of Josh all the time, and we talk all the time off here, so it doesn't translate that well on here.

Navy Blue 210

20K Miles on the street??? who's "norm" ??
Even 15K miles on the street for an
Agressive Solid Roller is Delusional IMO.

When I spoke with Cam Motion I stressed "Genteel Ramps"
& >.700" lift, I specced .680" and used T&D Rockers.
They were quite specific about checking springs between 3-5K miles.
I am highly confident the LLSR lobes from Cam Motion
are considerably less aggressive than the Comp Lobes
as well.

Navy Blue 210

This is a Valvetrain Stability issue (Cam,Springs, perhaps Rockers)
as opposed to a Cylinder Head issue.

Josh B.

And those valvey things that go in the cylinder heads.

chuzo

Hi Josh,
Do you mind sharing advice on the procedure for sealing the transmission with the differential?
I know there is a big O ring between them (I got it new), but in my case I still have oil leaking from the differential.

Thank you

Josh B.

I reused the original O-ring, cleaned it off, coated with some multi-purpose grease, and reinstalled it with the new RPM trans. I wish I could offer some advice as to your leak. Did you ensure the surfaces were completely clean? Is there any possibility that the O-ring got pinched?

FRiCK916

this is a cylinder head package issue.

the problem is not in the cores themselves, no.

Millenium Z06

Not to me. I don't mind changing springs but not at every oil change. F that.

Josh B.

I agree. Replacing springs on each oil change is just a band-aid for the real problem that there is a mismatch of components here. And if I have to replace 80% of the components to create stability, I'm going to move to a better cylinder head platform in the All Pros. Bigger spring pockets, better flow, Ti valves, and the combo has been proven and tested on record setting vehicles.