LT1Pat

I just replaced my stock LS7 heads with new PRC 265cc heads with stainless exhaust valves at the beginning of summer with a cam swap, made some good power, everything ran great. A few thousand street miles later I started hearing some ticking and started to investigate.

I'm really bummed out right now.

RamAir972003

Pm u

LT1Pat

I found what appears to be the tip of the valve resting in the valve cover, it appears to have just fell off from the valve. It doesn't look like the rocker failed either, it still has all its needles..

LT1Pat

Here's the hardened tip of the titanium valve.

RamAir972003

Very good catch hope you get it fixed....

richie427

sorry, Holy Shitt. When did you order your heads, cause iam waiting for my long block from TSP to get dropped off on monday, from UPS HUB. IT WAS AT UPS ON FRIDAY at6am. things like what you had, freak the **** out of me. Iam in the hole 20k an thats the tip of it all.NO thanks to GM. Hope everything works out for you, call TSP THEY WERE REALLY NICE to deal with, they just moved into a better place.

richie427

WHO INSTALLED YOUR HEADS/CAM into your car......

LT1Pat

I ordered it earlier this year during the winter, I wouldn't be too worried. It started making some noise and progressed somewhat rapidly so there was warning.

VetteVinnie

Missing lash cap?

phipp85

LT1Pat

PRC heads don't use lash caps. See "hardened tip" and I verified with PRC before installing them that they didn't need a lash cap.

LT1Pat

I did. I had to go with a slightly shorter pushrod to get the pre-load correct but otherwise it went smooth.

LT1Pat

Definitely, I posted the invoice above. I believe Trick Flow makes these titanium valves.

phipp85

Dang, you reply quick lol. I tried to delete that post after I saw the invoice. I would be having a few words with TSP for sure. Have you contacted them about it yet?

RamAir972003

I'm sure they will make it all good since you have to take the head off and redo the while head I would send it back to them good luck Pat....

LT1Pat

Not yet, just pulled the valve covers off today. I'll give them a call tomorrow and see what they think. I highly doubt this is PRC's fault but it could be an issue with their titanium valve supplier.

LT1Pat

After taking a closer look, #6 also failed but not quite as bad. Again, another titanium intake valve has its hardened tip missing. All of the 6 other intake valves that still have their hardened tip look good.

But the good news is that all the stainless exhaust valves look great!

Twistedpixels

Looks like a valve guide issue and the valve binded in the guide cause it to push the valve. Bad guide jobs can cause this I have seen it before. You need to call PRC about this. With my heads my porter actually put longer guides and spent a lot of time making sure the machine shop did it right.

LT1Pat

I was also thinking valve float but I never took it high enough to cause something like that. If the spring pressure were off maybe the valve touched the pistons. If any piston to valve contact occurred then it should be obvious when the heads come off.

richie427

CAM # HAHAHAH HEHEEH NO SORRY HOPE EVERYTHING WORKS OUT.. an what did you have done to her....