how to tell a 312 at a glance.

[jumping jack flash]

I know there is a way to tell the 312 from other Y blocks at a glance. I read a posting somewhere that told how, but I can't remember. Anyone remember the mark or casting to look for?

[clusterbuster]

www.ford-y-block.com/Block%20identification.htm       Here is where you can get your information.

[clusterbuster]

Looks like it is hard to tell the 312. Here is another way, but not the easiest.                  Since 312s were machined from the same block casting as a 292, they are nearly impossible to identify externally. Any casting number used on 312 blocks was also used on 292 blocks. Although most 312s were ECZ5015 followed by A, B or C, these can also be a 292. The best way to identify a 312 externally is by checking the flywheel flange on the crankshaft. The 312 ECZ crankshaft has an aspirin-sized dot on the outer edge. If the engine is disassembled, check the casting number on the main cap. ECZ is cast into 312 main caps; all others are EBU.

[Ecode70D]

2X like Clusterbuster stated.   Any other way is just very misleading.

[jumping jack flash]

The crankshaft dot was what I was trying to remember. Thanks ...I will write it down this time.