There's a used Y-Block on local Facebook. Says its a 312. Casting # ECZ-6015-C. I have not seen it as its 4 Hours away. Is that casting # a 312 for sure or is same # for a 292? Thanks I just looked at John Mummert's Site. ECZ-6015-C is a very common 312 Block but could be 292 if the Rod Casting # is EBU. Or check Crank Flange for the "Dot" but not all 312's have them. Only way to be sure is Rod Casting #. I will have to follow up with Seller.