I have had the same thing for a bit on a 318 I assumed it was the valve cover gaskets just dripping over to that flat spot. I have not swapped them out yet to see. I do not think its the intake cause you can see that seal pretty good although only true way to tell is leak down as above.


73 plumcrazy challenger - 318/904, edelbrock performer 600cfm carb, performer intake and cam. Eddy Alum. Heads 3.91 locker, Doug's headers, accurate ltd. exhaust
73 Cuda - Triple Black 340 4 speed
MIKE