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Abones , i wonder if it has something to do with bob selling the 8.1L cam cores for every application. I wonder if something is different with them, ever so slightly, in how the nose is machined

At this point in the investigation it seems likely that indeed is the case!! I think if there are more incidents like Tim and Budman show up that might seal that deal!!

Unjust worry how many guys install and don't check runout to know? It can spin but it's right so if you don't check runout and you don't spin can hear only when installed you would never catch it, I was more thorough on my builds then people know

One thing I've noticed with the ls firing order is it seems to be considerably more prone to reversion then the conventional firing order even with mild duration. I always assumed that the intake reversion from the Bob cams was probably a combination of the stupid exhaust timing events and possibly instability in the intake valve causing it to bounce on the seat. On engines with a bit of time on them you would start to see the heat and even more carbon tracking on the intake seat. I saw a couple that ended up loosing intake seal completely and looked like they werent far away from getting torched.

The good Cloyes timing sets come with the iwis chain too.

These are all issues that could have and should have easily been corrected. If you are selling a volume of parts like he was and there is a trend of issues I simple phone call to the Manufacturing side little adjustment in machining and the problem goes away. I remember a phone conversation to a well known Marine Engine builder I had some years ago. He explained to me the reason he used Bullet for his cams was they had CNC'd their cams and finished them off on a Cam grinder to get a better finish on the lobes and journals. I had a brief conversation with Bob about this and was assured the CNC finish with Cam Motions state of the art CNC was fine and finishing on a grinder was a waiste of time. Well I can tell you this. I have a Bullet cam with about 50hrs on it and there is know lifter tracking on any of the lobes the lobes are very shiny and almost have a mirror finish on them. The $700 Cam Motion/MK cam I have has track marks on the lobes after I spun the cam in the block by hand a dozen times with checker spring. So what's the deal? The finish on the CNC only cam look like crap. It looks like someone took a wire wheel to the lobes and journals on the cam. Differently far from a mirror like finish and it's kind of depressing when I think that I paid $700 for this piece of crap. I have some Sneider, Erson and a cast Comp Cam and none of these cams have such a poor finish on the. I wonder what would happen if you put a crankshaft in a motor that had a finish like this. Would it eat the bearings out of the motor? I'm sure if a CNC'd finish was acceptable on a Crankshaft that we would all have poorly finished dull looking journal cranks going in our engines. I was always told the more mirror like the finish on the crank the better. For that reason we would have our cranks sent out and wait weeks for them to come back because the finish we would get from the grinder two states away was so much better. And this is a part of the motor that has an oil wedge and no metal to metal contact. So, now we get back to the cam and lifter there is no oil wedge just splash oiling and direct metal to metal contact with lots of spring force being exherted but yet it's acceptable to have a sh!t finish hmmm. Sounds like a crock of sh!t to me.

So, it sounds like you have moved to tried and true Lunati Cams. Are you going with standard or LS firing order?

Calling RMBUILDER....

He's not gonna answer. Has caller ID. Need to three way with an out of your state number...