I got these 289 heads awhile back and was looking closer at both heads when I noticed some gold or yellow epoxy in all the intake bowls on one of the heads, I'm wondering if this was to fix mistakes or make the flow better. As you can see they have been ported and have other machine work done to them, I thought these would be great for a mild 280-300 hp build.
Can some of you guys enlighten me as to what that stuff is and is it safe for a daily driver. These heads were for SS class and the valves are stock size.
Can some of you guys enlighten me as to what that stuff is and is it safe for a daily driver. These heads were for SS class and the valves are stock size.





