<VV> 1964 engine fan questions

[Ramon Rodriguez III]

Hello guys.  Can anyone give me simple instructions to tell a 64 mag fan
from a 65 up version?  I know the bolt circle or hole is a different size.

Also if I remember correctly, only the 64 fan is good for use on a 145 cid
engine unless you swap out a bunch more parts.  Does the 64 fan go directly
onto a 62 or 63 top housing/bearing with 62-63 turkey roaster?  My
understanding is yes but I want to make sure.

What is the problem with putting a 65 up top housing and fan on a 145 cid
engine?  I think I have one this way and there is no apparent problem but I
don't know if that is luck or if it will lead to overheating?  I think I
remember that the problem is with clearance to the turkey roaster (too big
a gap maybe?) and/or pulley height issues.

My reason for asking is I intend to remedy the aforementioned mismatch of
parts to avoid any trouble it might cause.  A friend has what he thinks is
a 64 fan but before he ships it to me we want to make sure it is the
correct unit and also make sure my info on using it is correct.


Thank you!

Ray R.