ChevelleForum.net

Go Back   Chevrolet Chevelle Forums > Chevrolet Chevelle Garage > Restoration by the numbers

Reply
 
Thread Tools Display Modes
  #1  
Old 09-28-2012, 03:17 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default 72' SS 454 engine cooling fan...

Trying to figure out the correct part #. It seems to be quite clearly defined for 70' & 71' - but not 72'. The numbers I have seen for 72' so far are: 3999260, 3999265, 3947772. However, none have been 100% verified to my knowledge. Does anyone have an old GM book with part #s? Or a picture of one from an unmolested car?

TIA
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
  #2  
Old 09-29-2012, 07:36 AM
Hank70SS's Avatar
Hank70SS Hank70SS is offline
Moderator
 
Join Date: Dec 2009
Location: Brighton, MI
Posts: 4,719
Default

Try 3991431.
__________________
Hank

70 Chevelle SS396(454), M20, 3.73
My Chevelle
Reply With Quote
  #3  
Old 09-29-2012, 01:43 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default

On Team Chevelle they are calling that a fan for a 70's 350 with A/C. They claim the BBC cars got 18" fans, and the SBC cars got 19".
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
  #4  
Old 09-29-2012, 05:27 PM
Hank70SS's Avatar
Hank70SS Hank70SS is offline
Moderator
 
Join Date: Dec 2009
Location: Brighton, MI
Posts: 4,719
Default

Well, don't know what to tell you, don't have a book with the numbers. I know they list a different fan shroud for 72 BBC, what size is yours?
__________________
Hank

70 Chevelle SS396(454), M20, 3.73
My Chevelle
Reply With Quote
  #5  
Old 10-15-2012, 06:08 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default

I settled on an unstamped 3947772 fan. I couldn't find a 72' dated fan, I found one for early 73', and another for late 70'. The rest were repops or 69' dated.

IIRC, I have the 28" shroud. My Monte Carlo is a small block and has the 26" shroud.
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
  #6  
Old 01-01-2013, 04:16 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default

Just to update this... and to add to the confusion. I was able to look at a "survivor" car recently. It had a 3999265 fan instead of the common 772. The 73' dated 772 fan I found on eBay a while back is a real oddity. Possibly it was an over the counter replacement?
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
  #7  
Old 01-01-2013, 04:48 PM
Hank70SS's Avatar
Hank70SS Hank70SS is offline
Moderator
 
Join Date: Dec 2009
Location: Brighton, MI
Posts: 4,719
Default

I think the 772 I have on mine is dated 73. Don't know what it came off of.
__________________
Hank

70 Chevelle SS396(454), M20, 3.73
My Chevelle
Reply With Quote
  #8  
Old 02-05-2013, 05:14 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default

I located and purchased a 3999265 fan last night.
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
  #9  
Old 02-17-2013, 06:21 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default

Ok, here is some more clarification now that I have an example of each fan in my posession...

Your common "772" fan:



And a real deal 3999265 72' LS5 cooling fan vs. a 3999260 fan, used on SBC cars from what I can tell. (the shiny one is a 3999260 I restored and will not be using):







__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
  #10  
Old 02-17-2013, 06:26 PM
carpoor carpoor is offline
Senior Member
 
Join Date: Dec 2011
Location: Floriduh
Posts: 2,404
Default

So just to recap, I am 99.9% sure that:

3947772 fan is correct for 1969 & 1970 HP big block cars. (L78, L89, LS6, L72)

3989095 fan was used on 1971 LS5 & LS3

3999265 fan is specific to 1972 LS5 & LS3

Hoping this will clear up some confusion for others down the line.
__________________
1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 07:46 AM.



Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Audiokarma.org