Fan clutch question
Thread Starter
Burning Brakes
Joined: Oct 2002
Posts: 1,196
Likes: 47
From: Scarborough Maine Fredericksburg VA
Fan clutch question
What is the difference between a big block and small block fan clutch? I need a fan clutch for my 70 LT-1 and I can't seem to find one although I have seen several listed for a big block. They look the same, are they?
Thanks
Thanks
Racer
Joined: Feb 2009
Posts: 330
Likes: 9
From: Las Vegas Nevada
Are you talking about the fan, the clutch, or both? They both take a Hayden 2713 clutch.
http://www.haydenauto.com/upload/Hay...fan-clutch.pdf
The cars with AC usually have a better fan and more HD clutch.
http://www.haydenauto.com/upload/Hay...fan-clutch.pdf
The cars with AC usually have a better fan and more HD clutch.
Thread Starter
Burning Brakes
Joined: Oct 2002
Posts: 1,196
Likes: 47
From: Scarborough Maine Fredericksburg VA
Fan clutch. I realize the fan is different. The 70 LT-1 used a Schweitzer not a Hayden. I believe all Corvettes that year used Schweitzer but that may be wrong.
Team Owner
Joined: Sep 2006
Posts: 31,274
Likes: 4,366
From: Westminster Maryland
Hi spf,
I believe there were different fan clutch part numbers for sb, bb, and bb special hi-performance engines, and engines powerering a/c.
But according to the info in the 71 AIM the LT-! engine used the "production parts" fan clutch and fan, which I believe means it used the same fan clutch and fan as the base sb engine.
I'm looking at the info on the LT-! option pages.... UPC LT1, Sheet A4.
So I think at best you'd be looking for an appropriately date stamped sb fan clutch.
In 71 that would be a 3916139. Your 70 AIM will indicate what it was for 70.
Regards,
Alan
I believe there were different fan clutch part numbers for sb, bb, and bb special hi-performance engines, and engines powerering a/c.
But according to the info in the 71 AIM the LT-! engine used the "production parts" fan clutch and fan, which I believe means it used the same fan clutch and fan as the base sb engine.
I'm looking at the info on the LT-! option pages.... UPC LT1, Sheet A4.
So I think at best you'd be looking for an appropriately date stamped sb fan clutch.
In 71 that would be a 3916139. Your 70 AIM will indicate what it was for 70.
Regards,
Alan
