"451 Manifesto"

Cripes....we were stopping in at Arias Pistons over by Fontana back in the 80's, during breaks in racing at the finals in Pomona, just to pick up their " new" off the shelf Arias S7751 Pistons for the 451 combos we were already running back then.
Up until that time....for years
we'd been getting them custom built over at Venolia !

Anyways...it was a good article when I first saw it about 10 years ago, and good to see it's out there for posterity.....could use a few updates we knew back 40 years ago though...like;
* Main Caps are the same outer dimension...just a smaller "hole" for the Crank in the 400 Cap = Stronger with Detroit wonder iron.
* Cylinder wall thickness will usually sonic test pretty much the same from a B 400 to an RB 440....but the "unsupported" length of the wall is much shorter on the lowdeck 400 Blocks = Stronger
* It could also get into some prevention of #4 Main Cap walk ??...nobody wants to hear this, but we always found the stock 440 1053 Steel Cranks much easier on the mains, especially #4, because of their ability to " winde" and " un-winde" down their length as they spin....as opposed to todays 4340 " NON Twist" Cranks which tend to transfer and hammer the Block harder, and they were plenty strong enough for our 700hp stuff back in the day(all we had were iron heads)

Good article.