Howdy Rickv954:
I guess anything is possible if you throw enough time and money at it, but The easier thing (and probably cheaper is to import a 221 short block from Austrailia or South America, move up to a 250 short block, or have your rod journal ground down offset.
The last is probably the cheapest and easiest, but the least dramatic. If the rod journals need to be ground .010" to clean up, with an off set grind of .030" you lengthen the stroke by .040"- an additional .020" at the top and at the bottom of the stroke. That's not much, but for a quality machine shop shouldn't cost much more then a standard crank job. You'd use standard .030" under rod bearings. I ran some numbers on this once to figure displacement increase, but I've forgotten. I wasn't much of an increase.
The fringe benefits are less deck height, by .020", with no decking the block, less bearing drag because of smaller diameter rod bearings and less crank weight.
This is a common practice with SBF. AKA a poor man's stroker.
On the over bore I hope you mean .030" or .040". .3" or .4" is way out ofthe realm of possibilities. Those decimals can sure make things confusing.
This off-set ground crank stroker kit is home made. Get together with a quality machinist/engine builder and work out the details.
Adios, David
