Originally posted by techinspector1
You'd have to bore the 348 block 0.188" to fit a 409 piston. I don't think you could do it without hitting water. Here's a chart from Stan Weiss that will help you.........
http://users.erols.com/srweiss/tablersn.htm

I have read some chatter about using a 396/427 crank (3.766" stroke) or a 454 crank (4.000" stroke) by turning the main journal diameters down to the 348/409 size. The bore centers are the same on the two generations of engines, so the later crank will lay in the saddles.
been there, done that . 10k later i finished my stroker 476ci 409
there are so many little things that you have to do to fit the crank ,special pistons ,
mine was a 65 409
12.5 to 1 , 454 crank ,eagle rods , comp roller , lamar walden waterpump,and valve covers , msd , dual 500 cfm , made 602hp
wicked motor but very expensive ,
oh and to make the stroker you have to custom machine a starter head .