MTIRC6Z

What's hilarious is that these same few are completely ignoring the FACT that the OP has 123,000+ miles on STOCK valves which in itself isn't that shocking or new. What is different is that these same valves were in the engine at 88,000 miles when he found his guides to be completely shot and yet even after being run in such a hostile environment the valves have gone an additional 35,000 miles without failure...so much for needing solid valves to survive in a "hostile environment"

Cheers, Paul.

propain

How do you know the hostile environment is gone? Inspection and continued inspection.

The way to know its still there without inspection is to drop a valve like Madsen who was running SS valves in that hostile environment and the SS valve failed.

John_g_46 has 123,000 miles on the stock valves that came with the car. Case and point if the OEM valves are not in a hostile environment they wont fail.

The idea of using SS valves just in case you didn't fix the hostile environment is ridiculous. It has been proven that if you don't fix that hostile environment the SS valve will fail. Just like the OEM valve.

Since we are not seeing failure on heads that have addressed the machining issues with the guides while running SS valves or OEM valves it proves that the hostile environment has been mitigated. At least in the short term. It also proves that the use of SS valves in a stock or lightly modified engine useless and adds weight and potential problems down the road.

I think its strange how some professionals have not connected the dots on this yet.


Congrats to John BTW. Thats some high miles. Good to see people driving these cars.

DON T.

Fantastic testimonial Undy! great thread, iv got 78000 more miles to go...

MTIRC6Z

You do realise that when John found his REALLY bad guides at 88,000 miles he simply fixed the guides BUT continued to run the SAME valves for an additional 35,000 miles which got him to his current 123,000?

Not that I'm advocating running any valve in a hostile environment but it seems that at least John's stock valves could be run in such an environment (for how long we don't know) and still be used for at least another 35,000 miles after having done so. Is there even a single solid SS valved engine out there with 35,000 miles, never mind 123,000

Hmmmmm, so why is it that we all need to 'fix' our engines with those heavy-a$$ed valves

Cheers, Paul.

propain

So even in the hostile environment at 88K miles they hadn't failed and were cracking either? Interesting. Thanks for that info.

Vette @ 71

I'll use one of your favored recommendations " speak to a head specialty shop..

Dirty Howie

I'm comfortable with my statement which was argued against recently.


DH

erikszr1

the heads are preassembled so the builder on the name plate has nothing to do with the valve issue.

john_g_46

Installing the Yella Terras fixed the geometry problem...no longer "hostile environment".

'06 Quicksilver Z06

So if I follow you correctly, as an alternative to installing different valves as part of your management effort, you just went with a roller rocker instead of the stock rocker?

Any concerns about increasing over the nose weight as a result?

john_g_46

As long as you buy the set that is specifically designed for the stock springs, NO.

I rebuilt with original valves, silicon bronze guides and YT rollers.