Crank pulley bolt

[Mur1234]

Hey everyone,
I have an '87 Ciera 2.8 MPFI. I might attempt to replace the crank balancer. Does anyone know the crank bolt size? Or a part number from GM, Dorman, etc. I googled it and apparently there's a common bolt for sale for the Chevy 305, 350 that fits the 2.8/3.1 multi port. 

7/16" - 20 pitch.
2 1/2" length. 
5/8" hex head. 
Grade 8 threads. 
Can anyone confirm this?
I'd just match the bolt when I take it out. I'm a bit intimidated with removing balancer lol. I'd just like to find bolt before I even start. 

Thanks

[73blazer]

I can probably find a GM number for you in my GM A-Body parts book when I return later this week, but like you kinda eluded to, I don't think there is anything particularly special about it. Matching it from the local hardware store should be sufficient!

BTW. Welcome!

[Mur1234]

Thanks! 
Yeah it took a few hours but I found outdated part numbers. Dorman or ATP don't have a direct fit. 
Seems odd it's the same bolt for the 2.8, 3.1, 3.4, 3.5, 3.9 from '87 to 2011. CLEARLY no need for aftermarket support.

[73blazer]

According to the real GM parts book, the correct number for your car is 14102659 . It's M12 X 1.5 X 45
https://www.gmpartsgiant.com/parts/gm-bo...02659.html
Yeah, used on many engines up to 2012!

[Mur1234]

Thank you for the info!