sbc harmonic balancer oddity: need guidance

[dusterbd13]

ok, so ive got a 73 vintage 350 in my project. codes came back as a truck motor with a 3 speed behind it.
at some point it was freshened. unknown to what extent. runs good, sounds good, checks out healthy. pretty strong, too.

anyway, i converted it to serpentine accessories. in the process, i discovered that the harmonic balancer has 3 nubs sticking out in addition to the three pully bolt holes. ive never seen this. nor does any of the aftermarket pullies support this. all of them only have the 3 bolt holes. i drilled my serpentine crank pully to account for them, but it now does not run true. dont know why. planning on clearancing the holes a little more, and seeing if i can get it to self align.

makes me wonder just what the balancer is off of.
also, makes me wonder if i can grind those nubs off. make it so i can run an unmodified pully.
what do you small block guys say? im kind of baffled here.

michael

[SRD art]

interesting, I've never come across that. Good luck with the research. If it's a bother can you just get a normal replacement? I don't think they're that much for a stock one.

[dusterbd13]

best pictures i have. forst pic you can kind of see the nubs on the harmonic balancer.
second pic is of the v-belt pulley i removed with the nub holes, and the non holed serpentine pully matched together.

[shane38]

its a early 283 and 327 balancer....

[TheJDMan]

I would not waste my time on that balancer. You grind on it and you will only throw it out of balance, not that it has much mass to actually dampen anything. I recommed you install a FluidDampr or TCI aftermarket balancer.

[AintQik]

Yup, trash it and get a good balancer. Just double check the timing mark with the new one.