426 inch+ small blocks

What about long term reliability? What about the extra stress on the cylinder walls and block that really was not design for a 4 inch stroke?

I put over 2,000 miles on my new motor and it wasn't running until early July last year and went in to storage last Dec. Next season it might see 4,000 plus miles..hard use half of it. Seems like a 4 inch stroke might be worn out at 20,000 miles.

Guess right gears help keep the wear down but then a 7,000-7,500 rpm 340 might not make that much less power than a 6,000 rpm 400 CI.

IMO, the 360 stroke is ok but 4 inch seems pushing it too far to take abuse--unless you are running the HD blocks