XAXEXF

Just wondering which is more harmful for an engine in terms of timing - too much advance or retard.

The reason I ask is that after having my XF on the Dyno (250 Unleaded with crow cam, 465 Holly) I checked the timing and discovered that the guy had set it to 14 degrees. Is this OK or should I set it back to 10 degrees?

EDXR8

Dyno tuning usually sets the timing quite well. Unless there are problems, leave it. If you are worried, set it back to 10 degrees, and see how it goes.

T3man

The more advance the better for performance at higher engine speeds esp with your cam - just as long as it doesn't ping.

WBT56

Be careful about excessive timing. It may not ping in one gear on a dyno but with A/C? on, hot day, through the gears it may ping when you nail it. Auto or manual will both do it.

__________________
If you're not driving a manual you're really just steering.

XAXEXF

Thanks for your replys.
The engine did ping at full throttle in third gear on a hot day so thats why I decided to check the timing. I have since set the timing to 10 degress and the car feels just as responsive low to mid range but it does feel less willing at higher revs. However I have not had any pining since then so I think I will stick with 10 degress.

T3man

Sounds like you have it sorted now ... is good.