Right/Wrong BBC Pulley and Belts
Thread Starter
Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
Right/Wrong BBC Pulley and Belts
OK, can't really find a good picture to confirm and the AIM isn't clear enough. This is a 427 with Power Steering
From what I can tell I have the wrong pulley on the alternator.
As it is right now the alternator rides on the center grove of the crank.
The Power Steering is running on the front grove of the crank.
From a few pictures I could find this seems wrong.
The alternator should be on the front grove and the PS on the middle grove.
Is that correct??
From what I can tell I have the wrong pulley on the alternator.
As it is right now the alternator rides on the center grove of the crank.
The Power Steering is running on the front grove of the crank.
From a few pictures I could find this seems wrong.
The alternator should be on the front grove and the PS on the middle grove.
Is that correct??
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
My 70 has the alternator running off of the power steering pulley only.
I'd imagine it's the same for 69?
Going from memory...
I have a short belt on the rear groove of the water pump pulley which goes to the crank pulley only.
Another belt runs on the crank pulley, water pump pulley, and power steering pulley.
Found this posting from another forum member.
http://i160.photobucket.com/albums/t...vetteBelts.jpg
I'd imagine it's the same for 69?
Going from memory...
I have a short belt on the rear groove of the water pump pulley which goes to the crank pulley only.
Another belt runs on the crank pulley, water pump pulley, and power steering pulley.
Found this posting from another forum member.
http://i160.photobucket.com/albums/t...vetteBelts.jpg
Last edited by BBCorv70; May 29, 2014 at 02:33 PM.
Thread Starter
Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
Thanks, I found the same routing on a truck site.
But then why do I have a 3 grove crank if only 2 are used?
Maybe the 68-69 is a little different. Some of the pictures I can find on Google I can't link because they are no longer hosted.
Not sure if this will work but it shows a 68 with the alternator belt around the front grove and the PS on the middle grove.
http://www.google.com/imgres?imgurl=...d=0CCoQMygBMAE
But then why do I have a 3 grove crank if only 2 are used?
Maybe the 68-69 is a little different. Some of the pictures I can find on Google I can't link because they are no longer hosted.
Not sure if this will work but it shows a 68 with the alternator belt around the front grove and the PS on the middle grove.
http://www.google.com/imgres?imgurl=...d=0CCoQMygBMAE
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Thanks, I found the same routing on a truck site.
But then why do I have a 3 grove crank if only 2 are used?
Maybe the 68-69 is a little different. Some of the pictures I can find on Google I can't link because they are no longer hosted.
Not sure if this will work but it shows a 68 with the alternator belt around the front grove and the PS on the middle grove.
http://www.google.com/imgres?imgurl=...d=0CCoQMygBMAE
But then why do I have a 3 grove crank if only 2 are used?
Maybe the 68-69 is a little different. Some of the pictures I can find on Google I can't link because they are no longer hosted.
Not sure if this will work but it shows a 68 with the alternator belt around the front grove and the PS on the middle grove.
http://www.google.com/imgres?imgurl=...d=0CCoQMygBMAE
I see only two grooves being used on the crank pulley for all applications. Could be you have the wrong crank pulley. I can look at mine when I get home, think it's a two groove. The crank pulley should have a part number stamped on the flat surface, front side. Maybe see if it matches the AIM?
Are you shooting for originality? If not, other members have come up with some creative configurations.
Thread Starter
Le Mans Master
Joined: Mar 2001
Posts: 5,738
Likes: 644
From: Lincoln, CA
No not originality just correct. Because the alternator may be wrong the belt does not line up well.
The crank could be wrong as well as the alternator pulley so I need to know what is correct so I can order the parts.
The crank could be wrong as well as the alternator pulley so I need to know what is correct so I can order the parts.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
It's kind of hard for me to tell... But the water pump should be three groove, the alternator pulley should be single grooved, but a thicker pulley to allow the belt to match up with power steering pump. The power steering pump should be a two groove pulley and be cast iron.
Boy that back idler belt is a fun one to install too... it looks like your upper and lower pulleys may be correct, you can tell if the p/s pump pulley is correct by seeing if it's cast iron and make sure it lines up with the first and second groove of the water pump and crank pulleys.. .
The part numbers are on the picture
Willcox
Boy that back idler belt is a fun one to install too... it looks like your upper and lower pulleys may be correct, you can tell if the p/s pump pulley is correct by seeing if it's cast iron and make sure it lines up with the first and second groove of the water pump and crank pulleys.. .
The part numbers are on the picture
Willcox
Last edited by Willcox Corvette; May 30, 2014 at 12:57 PM.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
the other two pulleys look fine.. but the lower should be cast as well.. Hard to tell.. but if it is, it should have a p/n on it 3863108. From my standpoint... before you buy a bunch of other pulley that are expensive... I would get the alternator pulley, install it on the alternator and see if it lines up with the second groove on the power steering pump..... If it does then the rest should work for you.
Willcox
Willcox
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Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
FWIW: I have a two groove crank pulley, part number 3921923 and a 3 groove water pump pulley, part number 3889372, which agree with the AIM for an LS5. The alternator pulley part number is 3846180.
This combination should work on a 427 as well.
This combination should work on a 427 as well.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Last edited by Willcox Corvette; May 30, 2014 at 10:31 AM.
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Don't know if it helps
On my 72, 2 groove crank, 3 on the water pump, 2 groove P/S (cast)
The alt pulley is pretty much twice the thickness of a normal one with the groove out at the front which goes perfectly with the front p/s groove
This pic is on the cs144 I'm switching to but it's the pulley from the old alt and the mounting dims front - back are the same one the two styles,
In
A71Vette has his mounted with a set of spacers (seen where the alt mounts to the two different brackets) that I don't believe are stock but allow a single groove pulley to work and provide some much needed room at the valve cover
On my 72, 2 groove crank, 3 on the water pump, 2 groove P/S (cast)
The alt pulley is pretty much twice the thickness of a normal one with the groove out at the front which goes perfectly with the front p/s groove
This pic is on the cs144 I'm switching to but it's the pulley from the old alt and the mounting dims front - back are the same one the two styles,
In
A71Vette has his mounted with a set of spacers (seen where the alt mounts to the two different brackets) that I don't believe are stock but allow a single groove pulley to work and provide some much needed room at the valve cover