Okay. I'm interested. What has to be done to use '40 crank in the 400? I thought a fair amount of machining would be needed to clear everything - no? What else makes it cheaper than ..source 451 kits? And what heads would be good for a stock 400 with open chambers, in case I run into some.... thanks... I'm happy with my 400 right now as is, but always looking for more....
