" . . my dad used a timing light. I used a timing light. So I have to ask why are people avoiding using a timing light.
The trucks left the factory with the timing set to spec and they ran well. So why is it that not using a timing light now not the best way to go?
I have seen pre computer, computer controlled carburetor, fuel injection computer controlled engines run well set at spec.
Yet people continue to address the symptoms by changing the settings instead of finding out the problem.
.
."Good questions and good point.
I think the engine in question is a 1956 235.
1. When those factory timing marks were made (on the flywheel), the octane/characteristics of the gasoline was significantly different from modern gasoline.
2. No offense to anyone's truck/engine, but 90% of us have a non-original engine and/or a non-original flywheel. The flywheel was originally marked for a specific engine, in a specific year. There were more than one timing settings/marks used on high-pressure 235/261 engines. Flywheels and clutch assemblies on our trucks might not be original.
Hotrod Lincoln's timing technique and the vacuum-gauge timing technique do not care about the timing marks being original or correct. TDC/UDC is all that is needed to get you close.
Another aspect/benefit of using an inexpensive vacuum gauge is that it works on 6v and 12v systems (yes, I know the engine in question is 12v).
By the way,
a vacuum gauge can also be used in finding out problems.
Finally, 90+% of our 235/261 (and 216) engines have an easily accessible vacuum port. This timing technique is easier, cheaper, quicker, and less dirtying than most other techniques. And, it allows us to quickly check/adjust the carburetor mixture setting before we disconnect the vacuum gauge.
Sorry to waste your time, but you asked.
