Checked over at my shop today about the fan. I have a 5 blade with the large center hole, 4 bolt holes, approx 17 1/4" wide. Each blade has "5" rivets not 4. Checked my other 5 blade BB fans and they all have 5 rivets. This fan has a "W" and "H" stamped on the back side, front side says "front". This is obviously a blade for a clutch fan. My understanding is the 68 L78 engines in the Nova and Camaro all got the clutch style fan, but I think it had 7 blades. I have a repro clutch fan setup for my 68 BB car and it has 7 blades. Not 100% sure so others may want to comment and add their input. If you think this fan might help you, let me know.
Tom
