My 68 Firebird with 455 overheats at idle on hot days. I have big fan (no clutch), tight fitting shroud, fan half in, new 3 core rad, etc, etc. I figure I need to move more air through rad so I am looking for a smaller water pump pulley to speed up fan, around 6" instead of the 8" that came with the original 350. It may be a cheap fix for you. The clutch will prevent the fan driving too fast at speed.
|