exhaust cross over (heat riser) fill

Kevin Panzino · 10-09-2013, 08:37 AM

Interesting... I used the exact same Zinc material/part # from McMaster (9069K2) and when I pulled the heads after about 50 passes, I found the material melted back pretty bad in the port area.

Granted, I know it says it melts at 792°F, but I saw others using it with success, and figured there would be enough heat transfer into the head casting to keep it from melting...

Was going to use Aluminum next time (melting point ~1,220°F)....

No one else has melted the Zinc ???

10-09-2013, 08:37 AM	#11
Kevin Panzino Senior Member Join Date: Oct 2002 Location: Pittsburgh Posts: 578 Likes: 298 Liked 753 Times in 139 Posts	Re: exhaust cross over (heat riser) fill Interesting... I used the exact same Zinc material/part # from McMaster (9069K2) and when I pulled the heads after about 50 passes, I found the material melted back pretty bad in the port area. Granted, I know it says it melts at 792°F, but I saw others using it with success, and figured there would be enough heat transfer into the head casting to keep it from melting... Was going to use Aluminum next time (melting point ~1,220°F).... No one else has melted the Zinc ???