041 X heads

Adger Smith · 12-04-2021, 03:33 AM

X was put on cores that were used up and out of spec in some manner.
When they ran short on cores they might make a run with cores that were marked X for out of spec. Most X castings were done in core boxes that were out of spec with worn runner molds. That made the runners larger than spec when they were poured. There are some castings that have X's in the lower core box, water jacket passages, and no X up on top with the casting number. Only half of the core was out of spec in those cases. That is the information I got from a person that was supposed to know, a long time ago.
Most X castings I have had come through my shop were anywhere from 3 to 10 CC larger on the runner. Most of the time it was in the bowl area on the short side or by the guide. There were some with funny shaped Ex.

outlaw · 12-04-2021, 06:36 AM

The old timer that told me that info also said they were bigger in the bowl area so he was right about that part. Was thinking that maybe back in the day when gm ran a line of fleet vehicles maybe police and taxi were the same.
Terry

12-04-2021, 03:33 AM	#1
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 041 X heads X was put on cores that were used up and out of spec in some manner. When they ran short on cores they might make a run with cores that were marked X for out of spec. Most X castings were done in core boxes that were out of spec with worn runner molds. That made the runners larger than spec when they were poured. There are some castings that have X's in the lower core box, water jacket passages, and no X up on top with the casting number. Only half of the core was out of spec in those cases. That is the information I got from a person that was supposed to know, a long time ago. Most X castings I have had come through my shop were anywhere from 3 to 10 CC larger on the runner. Most of the time it was in the bowl area on the short side or by the guide. There were some with funny shaped Ex. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 12-04-2021 at 03:36 AM.

12-04-2021, 06:36 AM	#2
outlaw Member Join Date: Aug 2008 Posts: 137 Likes: 80 Liked 132 Times in 52 Posts	Re: 041 X heads The old timer that told me that info also said they were bigger in the bowl area so he was right about that part. Was thinking that maybe back in the day when gm ran a line of fleet vehicles maybe police and taxi were the same. Terry