Harmonic Balancer/Vib Damper Bolt size ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ch4x477 · 12-22-2004, 02:06 PM

A little while back someone, actually several people here wrote the bolt size for these things stating that buying a long bolt, a couple nuts and washers, chopping the head off the boltetc.... was a good way to "press " on the balancer. Well Im going to give it a try. But I need that size again ! 75 350 guys ! Thanks

jhow66 · 12-22-2004, 02:13 PM

Can buy one almost as cheap

http://www.jegs.com/cgi-bin/ncommerc...44&prmenbr=361

ch4x477 · 12-22-2004, 02:18 PM

I have one but it just barely reaches into crank and i dont want to pull the threads out !

Fred T · 12-22-2004, 04:14 PM

Thread on the sbc crank is 7/16-20, a tough score in all-thread. If you want to make one get a grade 5 6" bolt, cut the head off and thread the end with 7/16-14.

ch4x477 · 12-23-2004, 08:31 AM

Thats what I am looking to do ! The kids in the hardware store here (home depot ) arent much help so I needed that size before hand ! Thanks Fred

jimfulco · 12-24-2004, 01:08 AM

I use a piece of 7/16x20 threaded rod, a nut, a couple of fat washers, & some grease, along with the big factory washer. I got the all-thread at a local bolt place (look in the yellow pages), but you can get it on-line at www.mcmaster.com (search for threaded rods). If you really want to get fancy, get a thrust bearing (like a throwout bearing, but smaller) & use it between the nut & the washer.

12-22-2004, 02:06 PM	#1
ch4x477 Registered User Join Date: Apr 2004 Location: San Fernando Valley (Los Angeles) CA Posts: 41	Harmonic Balancer/Vib Damper Bolt size ? A little while back someone, actually several people here wrote the bolt size for these things stating that buying a long bolt, a couple nuts and washers, chopping the head off the boltetc.... was a good way to "press " on the balancer. Well Im going to give it a try. But I need that size again ! 75 350 guys ! Thanks __________________ 77 Chevy K-20 Some engine Tweaks ! 64 C-10 Shes crunched, But a new cab will will come along soon 87 Z28 Fuel injected 350 Didnt need a car, but couldent resist !!

12-22-2004, 02:13 PM	#2
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	Can buy one almost as cheap http://www.jegs.com/cgi-bin/ncommerc...44&prmenbr=361 __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

12-22-2004, 02:18 PM	#3
ch4x477 Registered User Join Date: Apr 2004 Location: San Fernando Valley (Los Angeles) CA Posts: 41	I have one but it just barely reaches into crank and i dont want to pull the threads out ! __________________ 77 Chevy K-20 Some engine Tweaks ! 64 C-10 Shes crunched, But a new cab will will come along soon 87 Z28 Fuel injected 350 Didnt need a car, but couldent resist !! Last edited by ch4x477; 12-23-2004 at 08:34 AM.

12-22-2004, 04:14 PM	#4
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Thread on the sbc crank is 7/16-20, a tough score in all-thread. If you want to make one get a grade 5 6" bolt, cut the head off and thread the end with 7/16-14. __________________ Fred There is no such thing as too much cam...just not enough engine.

12-23-2004, 08:31 AM	#5
ch4x477 Registered User Join Date: Apr 2004 Location: San Fernando Valley (Los Angeles) CA Posts: 41	Thats what I am looking to do ! The kids in the hardware store here (home depot ) arent much help so I needed that size before hand ! Thanks Fred __________________ 77 Chevy K-20 Some engine Tweaks ! 64 C-10 Shes crunched, But a new cab will will come along soon 87 Z28 Fuel injected 350 Didnt need a car, but couldent resist !!

12-24-2004, 01:08 AM	#6
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	I use a piece of 7/16x20 threaded rod, a nut, a couple of fat washers, & some grease, along with the big factory washer. I got the all-thread at a local bolt place (look in the yellow pages), but you can get it on-line at www.mcmaster.com (search for threaded rods). If you really want to get fancy, get a thrust bearing (like a throwout bearing, but smaller) & use it between the nut & the washer.



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