318 heads, 302 casting. Mystery holes?? (Solved!)
I’ve got the engine on the stand and pulled off the exhaust gaskets, and found a hole under each exhaust port that hadn’t been plugged. The holes are threaded and go directly into the port, and since they weren’t plugged, were leaking exhaust.
What are these holes for? My guess is that they’re for stock manifolds, and since the flanges on my headers don’t have holes for them, they were overlooked.
Next, what should I do? Should I simply plug them with a screw of the same pitch and call it good?
I’ve got the engine on the stand and pulled off the exhaust gaskets, and found a hole under each exhaust port that hadn’t been plugged. The holes are threaded and go directly into the port, and since they weren’t plugged, were leaking exhaust.
What are these holes for? My guess is that they’re for stock manifolds, and since the flanges on my headers don’t have holes for them, they were overlooked.
Next, what should I do? Should I simply plug them with a screw of the same pitch and call it good?
