I swear by Permatex Black Silicone, item# 81158
16B , it seals best in my opinion an is tough as heck when cured , an on older trucks without O2 sensors an such there is NP with the silicone.
I prefer it over there Blue glue or other mixes.


1952 Chevy Shortbed

Photos in Photobucket

If It Aint Broke Fix It Till It Is!