hey techinspector 1 do the math you see 1/2 the stroke a 454 is 4.000 1/2 of that is 2.000 the piston pin center is 1.765 the rod is 6.375 this rod is 250 long and the block is 10.200 add it up and it is 10.140 0.60 in the hole i have done this with a 427 tall deck i have built a lot of stroker big blocks 9.800and 10.200 i do know what i am talking about .i do not know how thick the walls are on a 366 but most big blocks are .200 thick or more it would need to be check.