The LA Motor "Block"

gregcon said

It's not a myth, or a hard fact, but rather a general guideline. We all know there are good and bad cores on a block-by-block basis. Your odds of getting a thick wall are better in an early block than any other years.

As for weight, it's a mathematical conclusion....before I bored my block, I calculated it would lose 10lbs.. After boring, I weighed it and it had lost 10lbs. It's just the weight of cast iron....

Click to expand...

That's just not true. In fact, as the casting process went through time, it got better and more consistent, with the advancement of modern technology. If you find a thicker block from earlier castings and it sonics good on both the major and minor thrust surfaces, you just got lucky and found a good one. I've gone through some early blocks with a sonic tester. Found a few that seemed "thicker" and most were right in line with everything else. There is much more consistency in newer castings as the years go by. Up into the later LA years and into the Magnum runs, they really got consistent with cylinder thickness block to block.

All of this started when people began the rumor that the 360 was somehow cast on the same molds as the 340 and that's just a myth that's been passed down through the decades. It just ain't so.

I had one of the crappiest years ever of a 360 "you'd figure"...a 1977 cast block. I had that block tested and it could have gone 4.100 with room to spare and it was even on all sides of the cylinders. All I went was .070 as I was building a 416.

You spout all the nonsense you want, but you're just as full of **** over here as you are on the .org site. It might mislead someone.