Exhaust Heat Passages

t.tosto · 03-14-2019, 06:42 PM

What material is best to block exhaust heat passages on iron heads, SBC?Also, what is best procedure to accomplish from intake side, thanks, Tony.

Tom Goldman · 03-15-2019, 08:46 AM

I haven't done any in a while ,but I used to use old cast pistons ,busted them up and melted in a iron pot on a turkey fryer burner . skim off the dross before pouring.
Make sure you have enough to do the fill in one pour . It helps to preheat the head casting as well to prevent the pour from shocking the casting and keeps the aluminum from chilling before the fill is complete.
I used furnace cement and chimney packing to dam the crossover in the port side and filled from the manifold side .
Be safe , take your time.

t.tosto · 03-15-2019, 12:35 PM

thanks Tom, Tony

03-14-2019, 06:42 PM	#1
t.tosto Member Join Date: Aug 2007 Posts: 154 Likes: 116 Liked 62 Times in 23 Posts	Exhaust Heat Passages What material is best to block exhaust heat passages on iron heads, SBC?Also, what is best procedure to accomplish from intake side, thanks, Tony.

03-15-2019, 08:46 AM	#2
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,476 Likes: 889 Liked 882 Times in 236 Posts	Re: Exhaust Heat Passages I haven't done any in a while ,but I used to use old cast pistons ,busted them up and melted in a iron pot on a turkey fryer burner . skim off the dross before pouring. Make sure you have enough to do the fill in one pour . It helps to preheat the head casting as well to prevent the pour from shocking the casting and keeps the aluminum from chilling before the fill is complete. I used furnace cement and chimney packing to dam the crossover in the port side and filled from the manifold side . Be safe , take your time. __________________ Tom Goldman 1500 SG , 1506 STK

03-15-2019, 12:35 PM	#3
t.tosto Member Join Date: Aug 2007 Posts: 154 Likes: 116 Liked 62 Times in 23 Posts	Re: Exhaust Heat Passages thanks Tom, Tony