lawnla

I have two(2) timing marks on a harmonic balancer for a 327/300 engine.
Anyone have any idea why or have seen this before. Not sure which should be used to set timing.

Thanks!

kevinkpk

Dunno. That balancer could have been on another engine, with a second mark. Where does the mark(s) set at the timing tab at idle, and how's the engine rpm? Is it hard to (slow) crank, but start? If so, the timing is too far advanced.

oldchevy

Set the engine at TDC and whichever mark lines up with 0 on the scale is the one to use.

lawnla

Thanks Old Chevy, TDC with the mark at 0 is what I did and engine runs smooth. Just never ran across this before.
Much thanks!