# IO-470 Continental

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#### Erik Snyman

##### Well-Known Member
Hello Listers
I have a few options in engines for a BD4 that I am resurrecting, one of which is the IO-470 VO Continental that needs to be opened up, as there is rust in at least 2 of the cylinder barrels. The engine has been sitting for an undetermined period of time, and it needs a complete rebuild.
Now for the reason for this post: Does anyone know if the cylinder bolt pattern of the -470 engine is the same as those for a -550 Conti? Could the -550 cylinders be fitted on the -470 case? Since I have to re-do the engine anyway, I was wondering if such a conversion would be possible/feasible. It would be nice to have 300 hp on the BD4s nose.
Merry Christmas to all,
Erik in Oz.

#### Bill-Higdon

##### Well-Known Member
Hello Listers
I have a few options in engines for a BD4 that I am resurrecting, one of which is the IO-470 VO Continental that needs to be opened up, as there is rust in at least 2 of the cylinder barrels. The engine has been sitting for an undetermined period of time, and it needs a complete rebuild.
Now for the reason for this post: Does anyone know if the cylinder bolt pattern of the -470 engine is the same as those for a -550 Conti? Could the -550 cylinders be fitted on the -470 case? Since I have to re-do the engine anyway, I was wondering if such a conversion would be possible/feasible. It would be nice to have 300 hp on the BD4s nose.
Merry Christmas to all,
Erik in Oz.
I'm not sure about this engine but the airboat builders have been putting cylinders from the various 0-520s on the PE-150s which is derived from the O-470

#### Pops

##### Well-Known Member
HBA Supporter
Log Member
Many years ago, I know of a man that took the 470 off his C-182 and put on a 520 from a C-310 and switched the data plate from the 470 to the 520 engine.
Great performing 1959 C-182. I'll never tell who.

#### TFF

##### Well-Known Member
There have been STCs to make 470s into 520s. Doable. I don’t know if there is any case machine work to be done. 550 I think has a different crankshaft, but not sure. Probably same cylinders as 520.

Naughty!!!
Erik in Oz.

#### Erik Snyman

##### Well-Known Member
There have been STCs to make 470s into 520s. Doable. I don’t know if there is any case machine work to be done. 550 I think has a different crankshaft, but not sure. Probably same cylinders as 520.
Since the engine and plane are both Experimental I dont think I will need the STC. My own butt on the line and so forth and so on....Would be nice to see what the STC is about, though. I will see what Google says and maybe pick up some dos and don`ts. Thanks for the reply, TFF.
Erik in Oz

....and Pops...

#### TFF

##### Well-Known Member
You May not need the STC but because they sell it; it’s doable. How you scrounge your parts is up to you.

#### Pops

##### Well-Known Member
HBA Supporter
Log Member
There have been STCs to make 470s into 520s. Doable. I don’t know if there is any case machine work to be done. 550 I think has a different crankshaft, but not sure. Probably same cylinders as 520.
I think you are right. Small increase in stroke.

I have flown the 1959 C-182 with the 260 hp, 520 engine. Nice airplane. That was the last year of the straight tail and had lighter EW from latter models.