BB Fan conversion, Back to basics!

[Forrest Gump]

Mine is 1975 SB, so in this case I suppose is "standard" clutch, cause I don`t have a lots HorsePower to my arsenal and yet during the summer the engine lock down, and revive the next day after a cooling night. So to make the story short, the Fan clutch type is related to the horse power, rather than the size of the fan right?!

You’re likely getting overheating problems because, as you said above, you don’t have a shroud for the fan. I doubt if changing the fan clutch type or blades would cure the problem - without the shroud the fan just won’t draw enough air through the radiator.
New shrouds are very expensive - Perhaps see if you can source a second-hand shroud or consider an electric fan set-up. Electric fans are okay for a small block - I can testify to that. (Knodty might sell you the one he is removing!)

 

[teamzr1]

Here are some shrouds for like $250 US or less

C3 Corvette Radiator Shroud (1968-1982)

Buy 1968-1982 Corvette Radiator Shroud online at Zip. Specializing in C3 Chevrolet Corvette Parts since 1977. Same day shipping. No-Hassle Returns.

www.zip-corvette.com

C3 1973-1975 Chevrolet Corvette Fan Shroud. Fiberglass - CA

Shop C3 1973-1975 Chevrolet Corvette Fan Shroud. Fiberglass - CA at Top Flight Automotive. From restoration to performance we offer the highest quality parts & accessories for your project.

www.topflightautomotive.com

Amazon.com

 

[Forrest Gump]

if you find it mate I’m happy to buy it off you if you want to sell it?

Pete, I’ve found it and it’s a seven blade, 18” diameter.
The clutch is seized.

 

[Knodty]

Pete, I’ve found it and it’s a seven blade, 18” diameter.
The clutch is seized.
View attachment 25078

Yes mate that is the same as my old one. Let me know how much it is inc postage and I’ll send you the money. Cheers Andy

 

[Knodty]

Looks a lot better than the last on I had.