Join Date: Aug 1998
Location: Waldorf Md. USA
I don't recall ever having seen a 327 with an 8 inch balancer, but I could be wrong. There are however at least three different timing mark locations and that is probably where your problem is. I dont think the timing mark lines up with the crank keyway on any of them. I would bet that someone has switched the balancer, or the front cover / timing marker somewhere along the line.
Also, how are you determining top dead center ? Unless you have the head off and are using a piston stop or dial indicator, it is very difficult to determine exact top dead center as the piston "dwells" at tdc for a couple of degrees at least. Looking at the timing gear, or crank keyway is not accurate enough.
If you have the head on and can get the type of tdc stop that screws in the spark plug hole, you can determine tdc pretty close. YOu have to turn the motor over by hand until it hits the stop, then mark the balancer. Then turn the motor backwards until it comes around and hits the stop again and mark the balancer again. TDC is exactly half way between your two marks.
Hope this helps,
Advanced Automotive Machine