My opinion/observations on the matter.......
Scoring in #s7/8 cylinders it most likely from some metal,debris or other source (broken ring/rings), could be as little as a spark plug elctrode or debris injested from the carb or debris from when the engine was assembled....only a tear-down will tell.......
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I followed their rules of changing oil at 500 and 2500 with correct oil. Funny in that first 500 miles, it used no oil, after was another story. Thank you for your advice. Cliff
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I'm guessing broken rings..........
Stroker motors especially with pistons that the oil ring goes thru the piston pin hole are notorous for oil consumption.....depends on the piston/ring combo, lately some manufacters have come out with newly designed pistons that keep the rings out of the pin hole....better IMHO...
Stroker motors depending on the rod length and piston are notorouis for scuffing the sides of the cylinder bore from the rod angle and side loading........
Stroker motors can be built to withstand all this and not burn excessive amounts of oil with the right parts and pieces.....
You did buy the motor with a written warranty explaining all the ins and outs of the warranty so you have to accept that. Doesn't make it easier to swallow, but it is what it is.......Personally, I think any manufacter should pay for shipping both ways if the problem is determined to be the fault of the manufacter....few do......
You paid a premium price for a Roush engine and should expect a premium motor,considering who the manufacter is........Seems as of late, we have been hearing of a number of problems with Roush motors...I would hope and pray with all his engineers, someone could figure out how to build a motor without these occuring problems...
Then you have the old "$hit happens" factor!!!!!!!!!!!!! No matter who builds the motor or what parts are used, sometimes things just happen.....
I hope you get the motor repaired or replaced and back on the road soon.........
David