Difference in small block & big block alternators
Thread Starter
Instructor
Joined: Jun 2003
Posts: 114
Likes: 0
From: Sydney NSW
Difference in small block & big block alternators
Hi i would like to know if there is any difference between a 1971 small block & big block alternators is the only difference with the pulley? can the B/block pulley be mounted on the s/block alternator . thanks for your time . 
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,335
From: North of Toronto - Ontario
Good Catch. That would actually make more sense than the way I thought
I just checked the 72 AIM and there looks like 3 different version
1100950 (42A stock SB)
1100543 42A (LS5)
1100544 61A (350 and 454 with AC)
All 10SI so the difference is likely the clocking between SB and BB????
M
I just checked the 72 AIM and there looks like 3 different version
1100950 (42A stock SB)
1100543 42A (LS5)
1100544 61A (350 and 454 with AC)
All 10SI so the difference is likely the clocking between SB and BB????
M
Burning Brakes
Joined: Dec 2006
Posts: 979
Likes: 254
From: Bethlehem, PA
Mooser gave the correct 1971 numbers and that they are 10SI; internal regulator. The shaft should be the same to swap your pulley. Keep in mind these are real simple to rebuild. Need a vice, some hand tools and a parts kit from ebay (not me http://www.ebay.com/itm/New-10SI-Del...FV66N-&vxp=mtr ) or elsewhere. Good luck.
