Harmonic Balancer Bolt Differences?!?
Thread Starter
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
Harmonic Balancer Bolt Differences?!?
Help!
I picked up an almost new ATI balancer for a good price over @ ThirdGen. I tried the bolts that came with my aluminum pulley set and they won't fit. I bought a Mr Gasket SBC harmonic balancer bolt set (which included only Grade 5 bolts--is that an appropriately strong grade of bolt for a harmonic balancer??!?) and it doesn't fit either...
What the?!? Anyone know if the ATI balancers use a different size bolt?
#Confused.
Adam
I picked up an almost new ATI balancer for a good price over @ ThirdGen. I tried the bolts that came with my aluminum pulley set and they won't fit. I bought a Mr Gasket SBC harmonic balancer bolt set (which included only Grade 5 bolts--is that an appropriately strong grade of bolt for a harmonic balancer??!?) and it doesn't fit either...
What the?!? Anyone know if the ATI balancers use a different size bolt?
#Confused.
Adam
Last edited by NewbVetteGuy; Apr 11, 2018 at 05:17 PM.
Thread Starter
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
I'll read the part #'s off of it when I get home.
I looked up the one part # I could find and it was just the part # for their SBC hub. (I THINK it's a 916951 because that's in my search history...)
The # I found on the balancer itself I couldn't find a match for online, but I can post it, too (although the bolt holes are obviously in the hub).
Adam
I looked up the one part # I could find and it was just the part # for their SBC hub. (I THINK it's a 916951 because that's in my search history...)
The # I found on the balancer itself I couldn't find a match for online, but I can post it, too (although the bolt holes are obviously in the hub).
Adam
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Shouldn't be anything special. Just normal stuff on all the ATI's I've used...
JIM
JIM
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Joined: Apr 2009
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From: Charlotte NC
I am assuming you are referring to the three bolts that hold the pulley onto the harmonic balancer.
If so...YES...Grade 5 is good enough....but if you have concerns....then get Grade 8.
Either it is 3/8-16....or 3/8-24 or metric.
Take it to a big box home improvement store that have machine bolts in the hardware area...which I know they do....and find one that fits....or take it to you local NAPA that should also have bolts.
DUB
If so...YES...Grade 5 is good enough....but if you have concerns....then get Grade 8.
Either it is 3/8-16....or 3/8-24 or metric.
Take it to a big box home improvement store that have machine bolts in the hardware area...which I know they do....and find one that fits....or take it to you local NAPA that should also have bolts.
DUB
Thread Starter
Melting Slicks
Joined: Jun 2016
Posts: 2,979
Likes: 332
From: Woodinville WA
The bolts that I have are definitely 3/8-24.
The bolt holes in the ATI Damper look courser than that and if I'm reading the ATI Super Damper Accessories page correctly, it looks like they require 3/8-16.
(Damper face bolts and pulley bolts are the same thing??!?) http://www.atiracing.com/products/da...arts/index.htm
Thanks everyone for your help! I was starting to fear that the threads were screwed up.
Part # on the hub: 916951
Part # on main body of the balancer: A379927
HA! I was able to take the hub part #, the outer diameter, and the fact that a magnet sticks to the case everywhere and reference the ATI Chevy part # chart to figure out that the balancer is a part # 917780
"Steel with Inner shell" I have no idea what that means or how it's different from the normal steel shell version (917785), but glad I finally have a part # considering that it's written NOWHERE on the part...
http://www.atiracing.com/products/da...s/damchevy.htm
Adam
The bolt holes in the ATI Damper look courser than that and if I'm reading the ATI Super Damper Accessories page correctly, it looks like they require 3/8-16.
(Damper face bolts and pulley bolts are the same thing??!?) http://www.atiracing.com/products/da...arts/index.htm
Thanks everyone for your help! I was starting to fear that the threads were screwed up.
Part # on the hub: 916951
Part # on main body of the balancer: A379927
HA! I was able to take the hub part #, the outer diameter, and the fact that a magnet sticks to the case everywhere and reference the ATI Chevy part # chart to figure out that the balancer is a part # 917780
"Steel with Inner shell" I have no idea what that means or how it's different from the normal steel shell version (917785), but glad I finally have a part # considering that it's written NOWHERE on the part...
http://www.atiracing.com/products/da...s/damchevy.htm
Adam
Last edited by NewbVetteGuy; Apr 12, 2018 at 01:11 PM.
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