While the 250 and 292 blocks are the same length, I thought the stock 292 water pump was a little longer, making the installed engine slightly longer.
I just measured my 250 and my 292. Both are 3-15/16" from the machined front block face to the front face of the water pump pulley, well give or take 1/32. So I conclude the 250 and 292 are the same length.
That said, you maybe right, some of the later-year 292 water pumps might be longer, just like the v8 was. Not sure about that. I may have even swapped some pumps around to get a shorter one, too long ago to remember.
