Alternator brackets Q? .. Difference in dimension

[BumpaD_Z28]

So I'm fighting an Alternator belt squeal at upper RPM's (about 4600-5400 redline) on my BBC in a 1967 Camaro. Alternator is mounted top of passenger side head (69+ style NOT 67 location), with a CHEAP chrome bracket on top, and the factory mounts for the rest ...

I already have a tried a HUGE pulley on it (5") too slow it down and that didn't do the trick ...

Question is between these too aftermarket brackets there is a 3/32" rear spacers dimension difference ???

.. I'm thinking that the MARCH one would put my belt "slightly" more inline as it look just barely too far forward now

March:
http://www.marchperf.com/instructions/Chevy%20Small%20Block/20125_instuctions.pdf

Billet Spec:
http://www.billetspecialties.com/assets/pdf/754.pdf

THOUGHTS ?

THANKS! ~DaVe

[BumpaD_Z28]

chirp, chirp, chirp ...

Ok so does anyone run anything besides stock alternator brackets ?

~DaVe :cheers:

[MrQuick]

how is your belt angles and gaps? pictures?

[Lowend]

The real problem is probably flex. Those chrome cheapie brackets flex a lot when you stress them.
The best brackets I have found (by far) are Alan Grove
http://www.alangrovecomponents.com/Catalog.htm
https://static1.pt-content.com/images/pt/2010/10/118L218R-1.jpg

[BumpaD_Z28]

how is your belt angles and gaps? pictures?

Well I don't have pics yet, BUT I do think FLEX maybe the issue as mentioned above ...

I ended up ordering the SUMMIT brand (cheaper) after talking to their tech line they gave me a confirmation on the 3.25" dimension ...

http://static.summitracing.com/global/images/instructions/sum-420102.pdf

Hopefully we will see how it works by the end of the week :)

~DaVe

[BumpaD_Z28]

Well I'm happy :) this summit bracket and a 7480 belt from checkers and no more belt squeal, now I need a lower RPM module in the MSD as I'm not short shifting for the belt, and the BB doesn't really have the parts to get the 6k chip ;)

https://static1.pt-content.com/images/pt/2010/10/sum420102_w-1.jpg

~DaVe