The Stovebolt Site Forums The Shop Area Engine Shop Two different harmonic balancers, why?

Help is a click away!

VEHICLE
INFORMATION
KITS

at the

GM Heritage Center
All the details are here.

Searching the Site - a click away

New here ??? Where to start?

Click on image for the lowdown.

====

Who's Online Now

5 members (Gray_Ghost, Hotrod Lincoln, klhansen, 2 invisible), 96 guests, and 1 robot.

Key: Admin, Global Mod, Mod

Forum Statistics

Forums66

Topics128,051

Posts1,055,729

Members48,426

Most Online14,466
Apr 26th, 2026

Step-by-step instructions for pictures in the forums

Brad Allen's photos

AD Chevy Trucks

Pictures galore

Over 6,000 pictures

Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips.

Check them out!

Lots of work on Brad's part ... pure enjoyment (and references) for you!

Big Thanks!

THANKS!

For helping keep this great
old truck web site
on the Internet for

over 30 years!

and not clogged down
with Ads!

Again, thanks!

Print Thread

Two different harmonic balancers, why? #1405985 04/14/2021 1:33 AM
Joined: Sep 2020 Posts: 23 OK N NeptuneGreen55 'Bolter
NeptuneGreen55 'Bolter N Joined: Sep 2020 Posts: 23 OK	Hello all, Can you gents shed some light on my two harmonic balancers? The one from my 235 has "indentions" in the cover hole and a 5/8" wide pulley, and the one from my 261 has a round center and a 3/4" wide pulley. Any reason? Thx! Attachments 7A7349D2-CB54-47C2-ADEA-783089392AAC.jpeg (423.47 KB, 128 downloads) Last edited by NeptuneGreen55; 04/14/2021 1:35 AM.

Re: Two different harmonic balancers, why? NeptuneGreen55 #1405988 04/14/2021 1:40 AM
Joined: Nov 2005 Posts: 6,100 B. C. Canada 3 3B 'Bolter
3B 'Bolter 3 Joined: Nov 2005 Posts: 6,100 B. C. Canada	Hy NeptuneGreen55, without pictures it is hard to understand what you are describing. 261 engines were installed in larger trucks and if installed in one with air brakes it may have had a 3/4" wide belt to drive the air compressor and other accessories, just a guess on my part?

Re: Two different harmonic balancers, why? NeptuneGreen55 #1405993 04/14/2021 2:08 AM
Joined: Sep 2020 Posts: 23 OK N NeptuneGreen55 'Bolter
NeptuneGreen55 'Bolter N Joined: Sep 2020 Posts: 23 OK	Pulleys. Bad pic. Attachments 8ADD4C73-E061-4671-9F26-D2DB46CEDC3B.jpeg (209.42 KB, 111 downloads)

Re: Two different harmonic balancers, why? NeptuneGreen55 #1406028 04/14/2021 1:02 PM
Joined: Jan 2001 Posts: 5,337 Snohomish,WA,USA P Pre '68 Dave 'Bolter
Pre '68 Dave 'Bolter P Joined: Jan 2001 Posts: 5,337 Snohomish,WA,USA	The one on the right is a car balancer, designed for a 3/8” belt. The one on the left is a truck balancer, designed for a 1/2” belt. See the USA in your vintage Chevrolet! My Blog

Re: Two different harmonic balancers, why? NeptuneGreen55 #1406029 04/14/2021 1:13 PM
Joined: Sep 2020 Posts: 23 OK N NeptuneGreen55 'Bolter
NeptuneGreen55 'Bolter N Joined: Sep 2020 Posts: 23 OK	Easy enough. Thanks.

Re: Two different harmonic balancers, why? NeptuneGreen55 #1406040 04/14/2021 2:51 PM
Joined: Jan 2001 Posts: 5,337 Snohomish,WA,USA P Pre '68 Dave 'Bolter
Pre '68 Dave 'Bolter P Joined: Jan 2001 Posts: 5,337 Snohomish,WA,USA	List of balancers for future use. Attachments 258E7C12-EAB2-422F-B8D1-9188D2182A32.jpeg (51.5 KB, 65 downloads) See the USA in your vintage Chevrolet! My Blog

Moderated by Phak1, Woogeroo

Hop To

Link Copied to Clipboard