65 and 66 200 internals the same?

[Anonymous]

I know the blocks are different, thanks to a post I read here. saved me a lot of trouble. was going to install a rebuilt 65 200 in my 66 bronco but now I can see that won't work. Now I plan on taking all the parts off the 65 and milling the 66 block .030 over to match the 1965 overbore.
I guess I would know when I tear down the 66 but it has all new gaskets and if it didn't work I would just put the 66 in the way it is.
thanks

 

[rickwrench]

Some of the first 200s were not seven bearing motors. They are rare but there are still some floating around. Count the core plugs on the block.
3 plugs = 4 bearing motor
5 plugs = 7 bearing motor

 

[powerband]

... Which brings up a question wether the later 170's with 3 freeze plugs are all 7 main or not. I have a great running 170 out of a '71 Maverick with a modded 250 head that I often wind over 5000 RPM. I've heard both sides of this but haven't yet opened it up to confirm .

Powerband 8)

 

[Anonymous]

... Which brings up a question wether the later 170's with 3 freeze plugs are all 7 main or not. I have a great running 170 out of a '71 Maverick with a modded 250 head that I often wind over 5000 RPM. I've heard both sides of this but haven't yet opened it up to confirm .

Powerband 8)

If it has 3 freeze plugs it's a 4 main bearing motor. None of the 7 main motors have 3 plugs, and none of the 4 bearing motors has 5 plugs.

Eric