Engine knock

[nuch_ss396]

Bill,

I had a 396 many years ago that had one piston with
excessive pin clearance and it knocked until it warmed up.
It drove me crazy for about 9 months. So, after taking the
engine apart, I found that the piston in question had a
crack right through the boss where wrist pin was positioned.

BTW, I never beat this engine and changed oil every 2,500
miles. It just happens some times. Also, once the engine
warmed up, the knock went away. I once took the car to
Maine in October ( cold as hell ) and when I started it up
early one morning, it sounded like it was going to throw
a rod or something. I paniced all the way home and did the
rebuild shortly thereafter.

Consider this possibility as well.

Steve