CLASS RACER FORUM - View Single Post - Mystery BBC head casting number 1X157129AC

6T9chevelle · 02-01-2010, 01:08 PM

I found a casting number which is very close to the one I am trying to find info on.

10051129...........rect..........Bowtie, Aluminum "raw"
casting, Symmetrical ports

If you compare the numbers change my x to a 0 and the 051 to 157. Those heads are high perf aluminum heads which are raw castings and made in 1988 which would explain the 58 date code. Could these possibly be an iron version which never made it to production?

02-01-2010, 01:08 PM	#19
6T9chevelle Junior Member Join Date: Oct 2006 Location: Lincoln Posts: 39 Likes: 0 Liked 0 Times in 0 Posts	Re: Mystery BBC head casting number 1X157129AC I found a casting number which is very close to the one I am trying to find info on. 10051129...........rect..........Bowtie, Aluminum "raw" casting, Symmetrical ports If you compare the numbers change my x to a 0 and the 051 to 157. Those heads are high perf aluminum heads which are raw castings and made in 1988 which would explain the 58 date code. Could these possibly be an iron version which never made it to production?