69 4 blade fan orientation in shroud?

[KevinW]

So, I have been running a 6 blade clutch fan in my 69 since I swapped engines (327/210 out, 350/300 HA in).  But it has always run on the hot side. Rebuilt radiator did not fix.  Fan blades were correctly half in/half out in the shroud.

So I decided to try the 4 blade fan, to see if it changes anything.  So this is all factory parts, 69 version fan, and correct 1" 3927792 spacer. 

It surprised me to find the the fan is no longer in the shroud.  It needs 1/2" or 3/4' more spacer to get halfway into the shroud.

Was this the was it was from the factory?

ps, still running hot.

 

[bcmiller]

How long is the spacer you are using now?

I am not sure exactly what is correct, but half in/half out seems to work for most setups.

What is your timing? If too much, it can cause an engine to run hot.

[David K]

Kevin,
Can you define "running hot"? That's a subjective term and leaves a very broad interpretation.  Assuming the radiator is clean, is it a 2 row or 3? 50/50 mix? Correct accessory belts and pulleys? Timing correct?

[GMAD_Van Nuys]

According to CRG, a 1 inch fan spacer was used for the small block V-8 in 1969 with the fixed 4 blade fan, whether the vehicle had a 2 or 3 core radiator:

https://www.camaros.org/coolingsystems.shtml

As there was only one fan shroud for the small block V-8 in 1969, your set-up looks okay to me. 

Besides checking your ignition timing as previously mentioned, your thermostat could possibly not be functioning properly and not restricting the coolant flow enough for the radiator to cool the fluid.

[KevinW]

Byron, its the correct 1" 3927792 spacer as noted in the "cooling report".

David, correct factory 3 row rad (rad was re-cored in the spring). 50/50 green mix, Factory SB with PS accessories and factory style belts.   

Timing might be a bit advanced, slight ping when 200r4 locks up. Engine is a factory 350/300 HA (10.25 comp) with 488 points dist.  When I installed the engine (10 years ago), I did set the dist as best I could and limited the "all in" advance.

No sure about the thermostat, I reads 215 deg when I shot it with a IF gun. Probably a 180 deg version, should I try a 160 deg?

I hope I can get the original 327/210 engine back in the car this year, trying to break it in on a run stand currently.

I will be using the 4 blade fan setup for the 327.  I just wanted to make sure the fan is located in the correct spot since it was not in the shroud like I thought it should be. 

[boomer632]

Maybe go for a spin running commando with no t-stat and see how hot it gets.. then work backwards from there selecting a thermostat. If it gets hot without, then maybe a jacket is obstucted.