Some engine info:
T&L 347 running Weber IDFs with Dart Pro1 heads and Hydraulic Lifters. Engine has 8300 miles on it.
Very recently noticed some stains on my freshly painted valve covers after returning from my 1300mi trip to the Dragon that appeared to be some fuel that burped out of the front RH front carb. (IDF’s) Took the air filter last night and noticed a bunch of carbon on the inside of the venturie stacks and underneath the air cleaner. The other three carbs aren’t showing this phenomenon. Any ideas what’s going on here? I have more of a backfire on the RH side of the car, but was attributing it to sealing on the header to side pipe slip joint connection. My exhaust manifold bolts all appear to be tight from a recent check. I’m noticing no performance issues other than a little carb spitting from time to time under initial throttle application. The car pulls very strong and all adjustment screws/linkage is secure and unchanged.
Here is a picture of the RH bank showing the stain on the valve cover and carbon in the stack of the front carb.
Here is the rear carb showing no carbon.
Here is the front carb showing the carbon.
Here is the underside of the air cleaners of the front and rear carbs.
Thanks in advance for your input,
- Allen.