66/67 vs 68/69 200ci

[waldo786]

What are the differences between these years 200 engines. Turns out my engine is from a 68/69 in my 66. Never realized it until now never thought or was told it had been changed when I bought it. Now I have a bunch of parts for the 66/67 and not sure what'll fit and what won't. I have a power rack and pinion I'm assuming will because the steering geometry would be for the 66/67. I have a classic auto air unit coming that now I'm not sure if it will work because of the different engine. I have a pertronix ignition system and I know the annular fuel carb I bought won't work... Any ideas on if this stuff will work b/c the engines are so similar?

 

[bookworm007]

From my reading not much would be different. The bellhousings changed alot on the 200s and so did the carbs other than that only real differences would be different pulleys depending on which assesories you have and emission related items including the distibutor.

 

[CZLN6]

Howdy Back Waldo:

The differences relate to the carb CFM and the distributor ignition advance systems. The '66/67 engines used an Autolite 1100 with a 1.2" venturi rated at 185 cfm. These carbs use a Spark Control Valve (SCV) to send a load sensitive vacuum signal to the vacuum advance cannister on the Load-O-Matic distributor. This distributor is a vacuum advance only system linked to the SCV in the carb. These engine years were rated at 120 HP @ 4,400 RPM, 190 Tq @ 2,400 RPM (Gross).

In the 1968 -'69 200s the Autolite 1100 carb was down-sized to a 1.1" venturi rated at 156 CFM and the SCV was eliminated and replaced with a ported vacuum source to match the distributor advance systems. The distributor is a more typical vacuum advance and a centrifugal, or mechanical advance. These engine years were rated at 115 hp @ 3,800 RPM and 190 TQ @ 2,200 RPM (Gross). This change came earlier in "Calif Emission" equiped engines that were built and sold in California in the '66/67 model years. There were also some EPA crutches tried during these years.

While the change in the ignition advance system made up for some of the loss in CFM, it could not recover it all. The decrease in rpm rating is a direct result of the decrease in CFM.

Another interesting difference, in print, is that the advertized Compression ratio decreased from 9.2:1 in '66 & '67 to 8.8:1 in '68 & '69. In fact, we could find no physical differences to account for the decrease in CR. Pistons remained the same, as well as typical deck height and gasket thickness. So what caused the decrease in advertized compression? Only FoMoCo admen know.

Your '66 did not have a R & P steering system from the factory. The steering system will not be effected by the engine changes. Nor will the AC. The Petronix may, or may not work, depending on the shape of the inside of the hole in the top of the distributor shaft. The "annular carb" you bought may work so long as it is an Autolite 1100 Non-SCV, Ideally with a 1.2" venturi, or, better yet, the high performance version with the 1.29" venturi.

I hope that relieves your mind some.

Adios, David

 

[waldo786]

Thanks for the great reply that info was very useful. I didn't figure there were that many differences but I'll have to see about the carb and the pertronix. Might just be easier to sell the ones I have and get the correct ones so there won't be any problems. Thanks again.