Valve Tip Issue, cavity ground into stem
#1
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After pulling my rockers today doing a cam swap, noticed that the #3 exhaust valve looked different. After inspection, there is a cavity ground into the stem about .040 deep and it's mushroomed out some. Any ideas as to what would have caused this? The rocker is smooth, but has the witness marks of the hole.
![](http://i83.photobucket.com/albums/j293/jaksonz28/IM003798.jpg)
![](http://i83.photobucket.com/albums/j293/jaksonz28/IM003798.jpg)
![](http://i83.photobucket.com/albums/j293/jaksonz28/IM003799.jpg)
#3
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Also forgot to mention these are old Patriot Stage 2 806 perimeter bolt heads with stainless 2.02/1.57's.
I'd like to know how it happened too. I had the rockers off another time when I advanced my cam, that was about 4k miles ago. I didn't notice anything out of the ordinary then, but I wasn't looking too closely being the motor only has 10k or so on it.
I'd like to know how it happened too. I had the rockers off another time when I advanced my cam, that was about 4k miles ago. I didn't notice anything out of the ordinary then, but I wasn't looking too closely being the motor only has 10k or so on it.
#5
TECH Addict
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A while back one of the valve manufacturers sent out a batch of valves that had insufficient hardness. The result of using these bad valves looks a lot like what your showing. I know at least some of these bad valves ended up in aftermarket LS1 heads. Might want to look into that... and take a close look at the rest of your valve tips.
#8
TECH Addict
iTrader: (4)
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There ya go...
https://ls1tech.com/forums/generatio...ad-owners.html
BTW the op's valve geometry appears to be good. That valve stem got peened right in the middle.
https://ls1tech.com/forums/generatio...ad-owners.html
BTW the op's valve geometry appears to be good. That valve stem got peened right in the middle.
#12
FormerVendor
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Valve tip surface finished started going away. Might have been something weird like lack of oil but I see stuff not quite that bad with stock rockers a lot especially with more pressure or shimmed up stands. This looks like maybe something got caught in between the two or started this and then it just kept going and getting worse. I have some MUCH worse than this. Also beehives cause more valve rotation as does floating valves and then they will get round wear like that at times.
#13
TECH Junkie
iTrader: (9)
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It's quite possible the bad valves ended up on heads other than AFR. AFR was the only one, to my knowledge, that stepped up and put out a recall.
Also beehives cause more valve rotation as does floating valves and then they will get round wear like that at times.