'406 cross bolted?'
Here is what Wikipedia says about it.
Testing of the 406, with its higher power levels, led to cross-bolted mains – that is, main bearing caps that were secured not only by bolts at each end coming up from beneath, but also by bolts coming in from the sides through the block. A custom fit spacer was used between the cap and the block face. This design prevented the main bearing caps from "walking" under extreme racing conditions, and can be found today in many of the most powerful and modern engines from many manufacturers.
Seems like Ford pushed things more to get good horsepower ratings.
More than Chrysler did with the '64 Hemi.It was rated low but treadheads
knew to get their hands on one pronto!
Here is a pic of show car by Ford called the Cougar 406.
A little promotion of the new engine.
See the gullwing doors? The '63 Corvette hardtop was meant to have
those but Chevy cheaped out.They were always doing that!
Here's link to Wikipedia on Cougar 406.
https://en.wikipedia.org/wiki/Ford_Cougar_406
Car was originally candy apple red.Real go go '62 color!
Some genius has picture of it on net with it painted Chevy metallic blue.
How to screw up a car when some yo yo gets a hold of it!