All Small Six Installing a 65-67 timing chain & gears on a later year emissions engine.

[wsa111]

What is the difference between later camshaft gears & earlier camshaft gears.
Did Ford advance the camshaft gears or retard them on later engines?

 

[Maketimber]

I can't tell you what ford did, but I recently put an early (pre smog) timing Chain and gears on my 81 200 and it did not seem to hurt things. I bought the timing gears and chain set on an engine builder's recommendation.

 

[78_200_C4]

Rockauto sells the same timing chain gear set for the 1965 200 and the 1978 200.
I read that Ford advanced the 1978 camshaft timing. It was ground in the cam not the gears.

 

[drag-200stang]

Ford racing in multiple print said the the 2.5 HSC rods were 5.---'' but they are 6.---'' about .050'' longer. Best to degree.
Ak Miller told me that the early 70's gears were retarded, but who knows for sure.