Either this guy is totaly ignorant or he's been smoking too much Maui Wowie...
1) A 261 has equal or greater wall thickness than a 235 - after all, this was Chevrolet's heavy truck engine.
2) The 261 has stronger rods and full-flow remote oil filtration (on later versions) which is something no 235 ever had.
3) The 235 and 261 have the same stroke.
4) He's right about one thing...to overbore a 235 to 261 is not only "silly", it's just not feasible, that's .187" and the block would fall apart if you didn't strike water first.
There's no substitute for cubic inches. Machining costs are the same, so why not go for another 28 cubic inches of torque?
