Originally Posted by Maximo

My modified engines actually will look almost 100% stock to the untrained eye...I do not cut a pile of material out of my engines at all...so there would be absolutely zero loss to structural reliability...

However there are some things to be considered with modified engines...
- they rev harder, faster and higher then stock engines do....so if you tune it lean, damage can happen faster
- because they have more power and RPM they can be over revved easier.
- If you abuse the modified engine, damage can happen faster
- tuning and setup do become a little more critical..these are legitimately modified engines, they do make substantially more output then the stock version...Any time you increase the output of an engine the sensitivity to setup and conditions does increase...However once setup and tuned correctly they will run much sweeter then the stock counterpart will..you will not only see a difference, you will also feel it in your trigger as well hear it in the exhaust note...the modified engines flat out scream !