Hello everyone, new here and this is my first post.

I have a fairly fresh Mark IV 454 engine that I put together. The engine was broke in on an engine dyno without any issues and ran well. The engine was warmed up and a few easier pulls made to ensure things stayed together. After that, several full hard pulls were made and there were no hiccups. My main goal here was to ensure a good break in of the new engine. After getting the engine home and taking some time to inspect things I noticed some abnormalities on my #7 intake valve rocker arm. The exhaust valves are standard 1.7 ratio and I employed some 1.8 ratio rockers on the intake side. These are Comp Cams Pro Magnum rockers. I am looking for opinions on what could cause this wear. I understand there could be one of many different things that could have caused this and I am hoping to narrow it down. Push rod length was measured, I have one piece hardened push rods installed, none of the other lifters have any visible wear anywhere near comparable to this and all rockers were adjusted initially and then gone over once more on initial start up. The picture with the two rockers visible is just for comparison and the picture with the lonely rocker is the culprit I am seeking opinions on. Any other questions, please ask.




Thanks in advance.

 

My first thought is lack of lubrication, the spring cap looks dry compared to the others in the other photo along with the crud under the roller on the damaged one, good oil flow would have kept that clean.

 

Yea, it did have more of that strange sludge on it. In this picture I had wiped it all down fairly well to get a better look at the tip. It was getting oil. Just as much as any of them were. Push rod was unobstructed as well. We did encounter some valve float on the dyno a couple times and I am wanting to contribute this to that. I could also see on the valve stem where the roller appeared to turn, enough so that it left a noticeable wear pattern in there with the centered one you would expect to see. No damage but you can definitely see where the roller tip strayed away from the "good" sweet spot.