> My son and I just finished up installing an 400 sbc engine in his > '79 El
> Camino. Has a mild cam and an Edelbrock alum. intake. (Performer).
> When it's cold, it runs fine. After the engine completely warms up, > it
> starts to miss and run very rough. The HEI dist. was working fine > when we
> took it off the old 305, and it now has new plugs, cap and wires. > Spark
> seems very strong. I'm thinking we have a manifold leak that shows > itself
> after the temp. has allowed the leak to open. Am I on the right > track
> here? My son was very careful with the manifold installation and I > watched
> him. Used silicone permatex between the gasket and manifold, and > Copper
> Coat between the gasket and head. Put a bead of the silicone at the > front
> and rear instead of the gaskets that always pinch out anyhow. How > can I
> determine if it's leaking? I've heard of spraying carb. cleaner at > the
> manifold to head junction and see if the miss clears out. Any help > would be
> appreciated. We need to get this thing fixed.
> Garrett Fulton
- posted 15 years ago