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Jim Cimarolli · 02-07-2010, 10:40 AM

The little plug has to mean post 1970, and the open chamber almost has to lead me to believe it is a prototype of an over the counter item. Somebody correct me if I'm wrong, but I don't think there was ever a production engine built by GM after 1970 that had a big port open chamber iron cylinder head on it.

02-07-2010, 10:40 AM	#1
Jim Cimarolli Senior Member Join Date: Mar 2002 Location: Sulphur Springs Texas Posts: 743 Likes: 146 Liked 166 Times in 46 Posts	Re: BBC casting #1X157129AC still a mystery. The little plug has to mean post 1970, and the open chamber almost has to lead me to believe it is a prototype of an over the counter item. Somebody correct me if I'm wrong, but I don't think there was ever a production engine built by GM after 1970 that had a big port open chamber iron cylinder head on it.