69 BB Backfire through exhaust
I have a 69 BB that was running fine with the exception that when the throttle was blipped and it idled down, the car would stall.
Turns out the car was running lean and the mixtures were adjusted to richen it up a tad using a gas analyzer.
As soon as I got the car back I noticed loud noises in the rear and hesitation under partial and full throttle, most likely backfire (after fire) out the exhaust. I think there was a backfire out the carburetor also but no where as loud as out the exhaust.
I have taken the car back to the engine tuner to have a look at, what should he be doing (I am not an expert but I want to make sure I ask a few questions to ensure the problem is sorted)?
I think he mentioned increasing primary jet size? When this is done does the car need the timing adjusted again?
The car has an aftermarket cam and does not run vacuum advance.