I believe this is where my question should start because the B20 engine that I will build is a "hybrid."

First off - I contacted Endyn about there block post kits. I am told they no longer sell these any longer. No big deal. The website states that the posts are made of 356-t6 aluminum. After some searching I have found that there is also a A356-t6. Is there a difference between these two alloy's? I know that T6 designates the "curing" process but that's it Could someone please tell me if these two names are for the same material?

2nd question - what is the thread form used for these so I can get a Die and make them. The slotted ends look like a hacksaw blade cut.

3rd question. What are the measurements/Posti