maximum modifications

.060" over is the standard for max boring, and a crank from a 4.2 makes it a 4.2 liter (same engine, different crank). Also SSM has a 4.3 stroker and there was a 4.5 liter race engine, but I don't remember who did it, do a search. Going over just a 4.2 stroker will cost $ and won't make hardly any more power, depending on your engine's volumetric efficiency.
 
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