stu in wichita
Active Member
- Joined
- May 13, 2013
- Messages
- 30
- Reaction score
- 2
I finally tracked down an annoying exhaust leak to an unlikely cause. The #7 port in the exhaust manifold don't match the port in the head. The engine is a 318 out of a 1970 truck with the original truck manifolds.
Compared to a gasket, the shape and size are correct, but the position is about 1/4" too far back. The mating surfaces are nice and flat. The misalignment is obvious when comparing the compressed area on both sides of the gasket.
I assume it's a bad manifold casting due to core shift or something. It almost couldn't be the head, right? I've never heard of anything like this. I tried building up the area with weld and resurfacing it. It sealed a little better (new gasket of course), but the tik-tik-tik is still there, especially until it warms up.
Any ideas?
Compared to a gasket, the shape and size are correct, but the position is about 1/4" too far back. The mating surfaces are nice and flat. The misalignment is obvious when comparing the compressed area on both sides of the gasket.
I assume it's a bad manifold casting due to core shift or something. It almost couldn't be the head, right? I've never heard of anything like this. I tried building up the area with weld and resurfacing it. It sealed a little better (new gasket of course), but the tik-tik-tik is still there, especially until it warms up.
Any ideas?