[simsalabim]

Hello all,

I am in the process of dialing in a recent 3.0L 81sc rebuild.

The motor runs well, except when the revs are low and the motor is under load (during moderately strong acceleration), it sounds like there is a bit of a "dieseling" noise coming from the exhaust area which disappears once hard acceleration ends.

The exhaust hangars are all tight and I do not believe there is anything rattling there. My current theories are:

1. pre-ignition
2. running rich
3. clog in the muffler (it has an older BB 2 in 1 out)

Any ideas on how I can check this out ? should I be overly concerned?

Thanks!