Correct '62 Fan?

[Mike M.]

Fellows: Is the fan in the photos attached a correct fan for a '62 (327/340)? Would there have been a fan clutch on such a '62 engine? Thanks for any guidance. Mike

[Mike E.]

Re: Correct '62 Fan?

Your car definitely would have had a clutch fan from the factory. The fan you have pictured is not correct. The rivets are not typical factory production, and the slots in the center should be holes, not slots.

[Jim L.]

Re: Correct '62 Fan?

That looks like an aftermarket "hot rod" fan like sold through Summit and Jegs. I use one like that on my stationary engine and it works well.... moves a lot of air, for whatever that's worth.

Jim

[Larry C.]

Re: Correct '62 Fan?

Correct fan for a 1962 Corvette would have 5 blades, not six. I can post or email pictures of original 62 fan and clutch if interested but am sure that there are many pics and details out there already.

Larry

[Joe L.]

Re: Correct '62 Fan?

That looks like an aftermarket "hot rod" fan like sold through Summit and Jegs. I use one like that on my stationary engine and it works well.... moves a lot of air, for whatever that's worth.

Jim

Jim-------


I agree. I've never seen an original GM fan with slotted mounting holes. I'm certain that no 1963-82 ever used this type of mounting holes and I really highly doubt that any C1 did, either.

By the way and on a totally different subject, did you ever rebuild a 1958 900R FI unit for a fellow by the name of Don Rettig?

[Eric E.]

Re: Correct '62 Fan?

It's not much to look at for condition but I believe that this is an original 62 fan and clutch.

[David L.]

Re: Correct '62 Fan?

Fellows: Is the fan in the photos attached a correct fan for a '62 (327/340)? Would there have been a fan clutch on such a '62 engine? Thanks for any guidance. Mike

Mike,

I believe that your 6-blade non-clutch fan was made by the Schwitzer based on the rivet patterns. Schwitzer made fans for GM starting about 1966 or so. Certain Buick, Oldsmobile, and Cadillac models were issued fans with 6 blade but generally with fan clutches but I assume that some models were issued the 6-blade non-clutch type fans as well.

Is there any stampings on any of the blades? Does the diameter of the fan measure 19" or 19 1/2"? Schwitzer usually stamped their part number and a date code on at least one of the blades and sometimes the GM part number as well.


Years ago I had an original 5-blade non-clutch fan w/slotted mounting holes made by Hayes-Albion that was used on 1970 Chevy Nova models with 396 engine wo/AC. I sold it for big $. I believe it was GM part # 3931001.

Dave

[Jim L.]

Re: Correct '62 Fan?

By the way and on a totally different subject, did you ever rebuild a 1958 900R FI unit for a fellow by the name of Don Rettig?

Twice, sort of.

First time was around 1990 when Don was first getting into vintage racing with his '58. Second time was about two years ago after Don sold the car; the new owner wanted the unit freshened up. It's a very well behaved, solid, reliable FI unit and Don went real fast with it.

I'm curious, Joe, how do you know of Don and/or of this unit? Don was an NCRS member only briefly and has passed away. I've lost track of where his old racer is now.

Jim

[Joe L.]

Re: Correct '62 Fan?

Twice, sort of.

First time was around 1990 when Don was first getting into vintage racing with his '58. Second time was about two years ago after Don sold the car; the new owner wanted the unit freshened up. It's a very well behaved, solid, reliable FI unit and Don went real fast with it.

I'm curious, Joe, how do you know of Don and/or of this unit? Don was an NCRS member only briefly and has passed away. I've lost track of where his old racer is now.

Jim

Jim-------


Twice here, too.

I first knew Don from way back when. He used to own a Shell gas station in Hayward and I met him in the course of my many years of employment with the City of Hayward.

Much later, we sold him that very FI unit he used on his 58 racer. That was the ONLY part I EVER sold in my entire life. And, shortly after I sold it, I regretted selling it and still do. It was a beautiful unit. It appeared almost new when I got it. I think it was an early take-off and then sat on a shelf in a guy's garage until I bought it.

I recall going up to see Don when he was tuning the car. He told me that we had sold him the unit too cheap. At the time he lived in Fremont, CA, just off Mission Bl.

I do know that he passed away several years ago.

[Joe L.]

Re: Correct '62 Fan?

Mike,

I believe that your 6-blade non-clutch fan was made by the Schwitzer based on the rivet patterns. Schwitzer made fans for GM starting about 1966 or so. Certain Buick, Oldsmobile, and Cadillac models were issued fans with 6 blade but generally with fan clutches but I assume that some models were issued the 6-blade non-clutch type fans as well.

Is there any stampings on any of the blades? Does the diameter of the fan measure 19" or 19 1/2"? Schwitzer usually stamped their part number and a date code on at least one of the blades and sometimes the GM part number as well.


Years ago I had an original 5-blade non-clutch fan w/slotted mounting holes made by Hayes-Albion that was used on 1970 Chevy Nova models with 396 engine wo/AC. I sold it for big $. I believe it was GM part # 3931001.

Dave

Dave------


There was once a fan of GM #3931001. Among other applications, it was used for 1970 Nova with 396 w/o SHP. It was discontinued in June, 1971 and replaced by GM #3990936. The latter was discontinued several years ago. Neither was ever originally used for any Corvette application. If either had slotted holes, they must have been one of an extreme few that were so-designed. Actually, I've never seen any original Chevrolet fan with slotted holes, but I really have not focused on non-Corvette fans. No original Corvette fan, PRODUCTION or SERVICE, from 1963-82 ever had slotted holes for the fan clutch mounting.

[David L.]

Re: Correct '62 Fan?

Dave------


There was once a fan of GM #3931001. Among other applications, it was used for 1970 Nova with 396 w/o SHP. It was discontinued in June, 1971 and replaced by GM #3990936. The latter was discontinued several years ago. Neither was ever originally used for any Corvette application. If either had slotted holes, they must have been one of an extreme few that were so-designed. Actually, I've never seen any original Chevrolet fan with slotted holes, but I really have not focused on non-Corvette fans. No original Corvette fan, PRODUCTION or SERVICE, from 1963-82 ever had slotted holes for the fan clutch mounting.

Joe,

Actually I had two 5-blade non-clutch type Nova fans "back in the day". The more that I think about the 3931001 fan had regular mounting holes while the 3990936 fan has slotted mounting holes. Both of them sold for big $ as these fans were quite rare. Back in the 1980's and 1990's I probably had at least 50 or 60 various Chevrolet, Corvette, and other GM fans in my collection.

Dave

[Joe L.]

Re: Correct '62 Fan?

Joe,

Actually I had two 5-blade non-clutch type Nova fans "back in the day". The more that I think about the 3931001 fan had regular mounting holes while the 3990936 fan has slotted mounting holes. Both of them sold for big $ as these fans were quite rare. Back in the 1980's and 1990's I probably had at least 50 or 60 various Chevrolet, Corvette, and other GM fans in my collection.

Dave

Dave------


The GM #3990936 actually replaced several earlier part numbers used on many Chevrolets (but not Corvettes). I believe it was a SERVICE-only piece, never used in PRODUCTION. If it was used in PRODUCTION, 1970 would have been the only year. The slotted holes are probably what it took to make this a more-or-less "1 size fits all" type of piece.

[David L.]

Re: Correct '62 Fan?

Dave------


The GM #3990936 actually replaced several earlier part numbers used on many Chevrolets (but not Corvettes). I believe it was a SERVICE-only piece, never used in PRODUCTION. If it was used in PRODUCTION, 1970 would have been the only year. The slotted holes are probably what it took to make this a more-or-less "1 size fits all" type of piece.

Joe,

I believe that you are correct about the 3990936 fan. The slots fit both the 1 5/8" and 2 1/8" bolt circles.

Dave