6 3/4 or 8 inch balancer - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skokie · 02-15-2007, 01:22 PM

I have to swap out my 6 3/4 balancer and I was up at summit looking around and I saw some 8 inch balancers. Which one would be better to use on a stock 350?

Thanks

Kid · 02-15-2007, 01:30 PM

The 8" balancer will perform its function better than a 6 3/4" can. (dampen the engine harmonics)
In this case, biger is better. It can be argured that it costs some HP, tho minimal.

RACINJASON22 · 02-15-2007, 01:41 PM

I would suggest the 8" on street driven engines for the better harmonic suppression.

skokie · 02-15-2007, 01:46 PM

Ok what about the pulleys? Will they bolt up to a 8?

RACINJASON22 · 02-15-2007, 02:41 PM

Yes the center hub and pulley bolt pattern is the same on both.

cooters · 02-15-2007, 08:51 PM

just make sure to change timing mark tab

BCOWANWHEELS · 02-15-2007, 11:41 PM

whatever came off is what i,d put back on . and i,d use a GM brand back on it if possible.

cooters · 02-16-2007, 12:18 AM

i use PIONEER brand balancers, good bang for the buck

skokie · 02-16-2007, 07:27 PM

I picked up a 8 inch the other day. I took off the 6 3/4 last night and the rubber was falling out of it. I got a new tab for it to. I will install it here in the next day or so. The truck is sitting in the driveway and I got a bunch more to do to it before it hits the road again

cooters · 02-16-2007, 09:16 PM

make sure you use an install tool (not a hammer)

**WorkinLonghorn** · 02-16-2007, 09:26 PM

Quote:

make sure you use an install tool (not a hammer)

The last time I did this I think I just torqued the mounting bolt and it went right on,but then my memory ain't what it used to be.Maybe I rapped the inner hub with a mallet.Did I screw up? TDC seems to be way off 10,000 miles later.

BCOWANWHEELS · 02-16-2007, 09:29 PM

most 8" balancer came from 4 bolt main engines and steel cranks

*rage'nrat638* · 02-16-2007, 09:33 PM

THIS IS THE TOOL for installing

Stroker · 02-16-2007, 09:48 PM

skokie, It depends on the year of your truck and what options you have. On my 68 which was originally a 327 I had some interference with the power steering pump when I switched to a 8". I ended up having to switch to a later model power steering bracket to have enough clearance. If you don't have PS or already have the later model bracket the 8" should be fine and probably does a better job.

cameeks · 02-16-2007, 10:47 PM

Quote:

Originally Posted by WorkinLonghorn

The last time I did this I think I just torqued the mounting bolt and it went right on,but then my memory ain't what it used to be.Maybe I rapped the inner hub with a mallet.Did I screw up? TDC seems to be way off 10,000 miles later.

(Not recommended)
Back when I started working on engines my first balancer install I taped it on untile i could get some threads started then impacted it the rest of the way. For the rest of the time I had that engine I had to soak the balancer bolt in red lock tight then install it becouse the impact stripped out the snout on the crank.

skokie · 02-17-2007, 12:58 AM

I do have a installer tool that looks similar to what regenrat has there. I hope I dont run into the interference issue with the power steering. I may have to do a test fit to make sure.

cooters · 02-17-2007, 11:31 PM

the other problem with the hammer install is beating up the thrust bearing in the crankshaft

02-15-2007, 01:22 PM	#1
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,334	6 3/4 or 8 inch balancer I have to swap out my 6 3/4 balancer and I was up at summit looking around and I saw some 8 inch balancers. Which one would be better to use on a stock 350? Thanks __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

02-15-2007, 01:30 PM	#2
Kid Senior Member Join Date: Jun 2002 Location: Kansas Posts: 702	Re: 6 3/4 or 8 inch balancer The 8" balancer will perform its function better than a 6 3/4" can. (dampen the engine harmonics) In this case, biger is better. It can be argured that it costs some HP, tho minimal. __________________ The kid Build threads: 51 Jimmy http://67-72chevytrucks.com/vboard/s...d.php?t=154951 http://67-72chevytrucks.com/vboard/s...d.php?t=219902 http://www.classictrucks.com/feature...uck/index.html 68 C10 http://67-72chevytrucks.com/vboard/s...ad.php?t=50348

02-15-2007, 01:41 PM	#3
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: 6 3/4 or 8 inch balancer I would suggest the 8" on street driven engines for the better harmonic suppression. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR!

02-15-2007, 01:46 PM	#4
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,334	Re: 6 3/4 or 8 inch balancer Ok what about the pulleys? Will they bolt up to a 8? __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

02-15-2007, 02:41 PM	#5
RACINJASON22 GEARHEAD Join Date: Jan 2007 Location: CENTRAL,PA Posts: 2,284	Re: 6 3/4 or 8 inch balancer Yes the center hub and pulley bolt pattern is the same on both. __________________ 72 SWB 2WD MY PROJECT 72 LWB 4X4 FUTURE PROJECT SUBSCRIBE HEREBOARD VENDORS HERE NORWOOD MEET SURVIVOR! Last edited by RACINJASON22; 02-15-2007 at 02:42 PM.

02-15-2007, 08:51 PM	#6
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: 6 3/4 or 8 inch balancer just make sure to change timing mark tab

02-15-2007, 11:41 PM	#7
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: 6 3/4 or 8 inch balancer whatever came off is what i,d put back on . and i,d use a GM brand back on it if possible.

02-16-2007, 12:18 AM	#8
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: 6 3/4 or 8 inch balancer i use PIONEER brand balancers, good bang for the buck

02-16-2007, 07:27 PM	#9
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,334	Re: 6 3/4 or 8 inch balancer I picked up a 8 inch the other day. I took off the 6 3/4 last night and the rubber was falling out of it. I got a new tab for it to. I will install it here in the next day or so. The truck is sitting in the driveway and I got a bunch more to do to it before it hits the road again __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234 Last edited by skokie; 02-16-2007 at 07:27 PM.

02-16-2007, 09:16 PM	#10
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: 6 3/4 or 8 inch balancer make sure you use an install tool (not a hammer)

02-16-2007, 09:29 PM	#12
BCOWANWHEELS Registered User Join Date: Nov 2006 Location: KINGSPORT,TN. Posts: 3,035	Re: 6 3/4 or 8 inch balancer most 8" balancer came from 4 bolt main engines and steel cranks

02-16-2007, 09:33 PM	#13
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	Re: 6 3/4 or 8 inch balancer THIS IS THE TOOL for installing Last edited by rage'nrat638; 07-12-2007 at 06:56 AM.

02-16-2007, 09:48 PM	#14
Stroker Registered User Join Date: Mar 2001 Location: Moore, Ok Posts: 1,149	Re: 6 3/4 or 8 inch balancer skokie, It depends on the year of your truck and what options you have. On my 68 which was originally a 327 I had some interference with the power steering pump when I switched to a 8". I ended up having to switch to a later model power steering bracket to have enough clearance. If you don't have PS or already have the later model bracket the 8" should be fine and probably does a better job. __________________ 72 SWB parts and pieces Oklahoma

02-17-2007, 12:58 AM	#16
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,334	Re: 6 3/4 or 8 inch balancer I do have a installer tool that looks similar to what regenrat has there. I hope I dont run into the interference issue with the power steering. I may have to do a test fit to make sure. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

02-17-2007, 11:31 PM	#17
cooters Senior Member Join Date: Oct 2006 Location: Edmonton Alberta Posts: 458	Re: 6 3/4 or 8 inch balancer the other problem with the hammer install is beating up the thrust bearing in the crankshaft



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