Okeh, so you disagree with what the actual, real chief engineer of the slant-6 has to say (in great detail and with strong documentary evidence) on the subject. That's a little strange of you, but whatever. Have you read Weertman's books?
Ah, I see your error. What is said (and supported) is that the slant-6 was originally designed to be an aluminum block, not that the slant-6 was originally designed to be the specific aluminum block as it was produced from '61-'63. What is meant by "designed to be an aluminum block" is that the basic geometry of the enginethe deep skirt, etc.was conceived and specified so as to be compatible with an aluminum block material. That, in turn, means the iron block made with that geometry is exeptionally rigid and strong. That's all.
