What are the main reasons that newer high performance engines can go much longer without a total rebuild than older engines we build? For example, the 485hp SRT challenger motor compared to a fresh built 500 hp aluminium headed 440 running less than 10.5:1 compression. . In most cases the 440 would need a rebuild or at least bearings and maube rings at a much shorter interval than the 392
Main reason....Tolerances and capability.....plain and simple.
I worked at one of the largest US based engine plants in the country....Control the tolerances thru in-process gauging, and it will last...Knowing what tolerances have to be held is one thing, measuring them & holding them is another.
