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Author Topic: SB Balancers are they ??  (Read 3370 times)
opelitis1
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« on: October 28, 2010, 03:38:41 PM »

How are SB balancers easily identified??  Seems to be codings of some sort on the front anf on the inner hub on the rear GM numbers.  How can I tell a low HP units from a high HP 327 or 350ci units.
Thanks!
Ted
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JohnZ
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« Reply #1 on: October 29, 2010, 11:22:51 AM »

Higher-horse balancers were 8" in diameter, and about 1-3/4" thick; low-horse were thinner, and about 6-1/2" or so in diameter.
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'69 Z/28
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Petes L48
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« Reply #2 on: October 29, 2010, 03:20:53 PM »

I believe, for 67 at least, the 350 and 302 were the only Camaro SBC applications that used the bigger 8 inch balancer.  Can't recall if the same part number.

Update - I did find an older thread that talked about 302 balancers where Jerry M said that the 350ci 8 inch was narrower than the 302.  Forgot to copy the URL.    
« Last Edit: October 29, 2010, 04:40:19 PM by Petes L48 » Logged
opelitis1
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« Reply #3 on: October 29, 2010, 03:54:10 PM »

Okay the balancers (13) in all that I am trying to de-cipher have codings on the front outside ring and on the rear inside ring there are hard to read GM raised numerics.  How many different sizes of balancers and earlier "hubs" were there as I have a 265 (55) style with no oil filter provision on the driver's side of the  Mod Prod  engine?  Believe they used Hubs at this point in time.. Need help from the older crowd on this 'un re the Hubs instead of balancers part of the thread..
Thanks Gennellmen!! and, oh yeah, have a great Thanksgiving! !
Ted
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1968RSZ28
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« Reply #4 on: October 29, 2010, 05:10:24 PM »

Update - I did find an older thread that talked about 302 balancers where Jerry M said that the 350ci 8 inch was narrower than the 302.  Forgot to copy the URL.   

Here it is...  http://www.camaros.org/forum/index.php?topic=6408.0

Paul
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1968RSZ28
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« Reply #5 on: October 29, 2010, 05:14:12 PM »

Thanks Gennellmen!! and, oh yeah, have a great Thanksgiving! !
Ted

Thanks Ted!  Hope you have a great Halloween too...    Grin    Cheesy    Wink

Paul
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JohnZ
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« Reply #6 on: October 30, 2010, 09:15:47 AM »

Okay the balancers (13) in all that I am trying to de-cipher have codings on the front outside ring and on the rear inside ring there are hard to read GM raised numerics.  How many different sizes of balancers and earlier "hubs" were there as I have a 265 (55) style with no oil filter provision on the driver's side of the  Mod Prod  engine?  Believe they used Hubs at this point in time.. Need help from the older crowd on this 'un re the Hubs instead of balancers part of the thread..
Thanks Gennellmen!! and, oh yeah, have a great Thanksgiving! !
Ted

'55-'57's used a riveted-together 6" balancer that had the crank pulley riveted to the hub; '58-'61's used a similar balancer, but the pulley was bolted on. Photos below show '55 V-8's (no oil filter or side engine mount provision) on the shipping dock at Flint V-8.
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opelitis1
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« Reply #7 on: October 30, 2010, 12:22:25 PM »

Thanks John!! Keep stubbing me toe on a  pipe that emits from the 1955 3703524 block.  Any idea what code V12371 or I stands for??
Thanks!! 
Ted
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JohnZ
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« Reply #8 on: October 31, 2010, 12:05:07 PM »

<<Thanks John!! Keep stubbing me toe on a  pipe that emits from the 1955 3703524 block.  Any idea what code V12371 or I stands for?? >>

The first-year-only '55 524 block had a road draft tube installed inside the back of the block, between the rear face and the flywheel; you can see the cast-in opening for it near the top left of the photo below. That hole was removed for '56, and the road draft tube became external.

Is that code stamped on the front pad on the '55 block? If so, it's not factory - the "V" prefix wasn't used until 1967 (the "1237" part doesn't make sense either). Got a photo?
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opelitis1
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« Reply #9 on: November 02, 2010, 06:02:42 AM »

Good morning to yah John!! I'll take a pic or 2 of the 265ci block. Will post them up tomorrow when wifey gets home.
Hate to bug dee old hen, but that's the only way we gonna get to see the shots.
Ted
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Classic Gary
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« Reply #10 on: November 02, 2010, 03:24:44 PM »

small block hub only was on a 283 with a CAST IRON crank.
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opelitis1
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« Reply #11 on: November 03, 2010, 05:34:23 AM »

Looks like I split my balancer code  thread in two.  One for balancers and 1 for the 265 block codes, I will measure the balancers i.e. by diameter and width and take some pics.
If I may here are some shots of the 265 CANADA  block dated L 20 4.  While checking the pics I noticed another coding and I will get a better view of it as it looks like another GM punch.
Will get back later on the balancers'  with some pictures of the codings.
Enjoy some history..
Ted
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opelitis1
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« Reply #12 on: November 03, 2010, 05:41:58 AM »

Here you go, eh..
Ted
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opelitis1
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« Reply #13 on: November 03, 2010, 05:44:44 AM »

More!
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opelitis1
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« Reply #14 on: November 03, 2010, 05:49:46 AM »

Suffix code of block stamped Canada
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JohnZ
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« Reply #15 on: November 04, 2010, 03:47:39 PM »

Suffix code of block stamped Canada

Don't know what that might be; if it has a "Canada" embossment (raised cast-in characters), it's from McKinnon Industries; their production blocks had a "K" prefix.
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JohnZ
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« Reply #16 on: November 04, 2010, 03:54:08 PM »

small block hub only was on a 283 with a CAST IRON crank.

It's the other way around - forged 283 cranks only required the hub, but 283's with the nodular iron cast crank required a full harmonic damper (and the late block that was clearanced for the #8 counterweight).
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opelitis1
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« Reply #17 on: November 05, 2010, 05:21:44 AM »

Here are a couple more for your viewing pleasure of the 265 block dated Dec 20 1954.  There are punched numbers close to where the "Canada" punch is.
Engine was either a Junior Stock or Gasser from the 60s/70s.  Gonna dig up more info. 
Believe I still have the hub tucked away here and if so, I'll clear the hub/balancer mystery maybe up a bit.  I always thought cranks were forged in the early 265/283 days and not cast..
Will measure up the thread starter balancers in the next two weeks and show numbers punched on the outer hub and try'n de-cipher the GM numbers on the rear inner hub.  Could be interesting!
Ted
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JohnZ
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« Reply #18 on: November 05, 2010, 03:58:09 PM »

I always thought cranks were forged in the early 265/283 days and not cast..

All 265 cranks were forged, and so were all 283's until late 1964, when Flint V-8 began producing some 283's with cast nodular iron cranks.
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opelitis1
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« Reply #19 on: November 06, 2010, 04:57:29 AM »

Good morning John!!  Any idea what the 3867 code is for?? 
Thanks!
Ted
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JohnZ
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« Reply #20 on: November 06, 2010, 10:43:17 AM »

<<Good morning John!!  Any idea what the 3867 code is for?? >>

Back in '55-'56, engines carried sequential serial numbers (unrelated to car serial numbers), normally stamped on the front pad, followed by the code for the plant, date, and suffix (photo of '56 pad below); that might be what the 3867 is, although it's covered by the front of the intake manifold. That's a strange one.
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opelitis1
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« Reply #21 on: November 06, 2010, 08:07:28 PM »

Will take a better shot of exactly where the 3867 code is, 'cause it is not in the usual spot for codings.  Sorry about the angle, my fault. I appreciate the help by the way.
Ted
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opelitis1
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« Reply #22 on: November 09, 2010, 07:11:20 AM »

Pictured below are the 265 balancer of the left and a 283 unit on the right.  Both are 6 inch in diameter and with years of paint on them, I measured widths of .625 for the 265 engine, and
.780 for the 283 engine.
Check the size of rivets on the 265 model. Can't see p/n 's on them though.  Might be interesting to weigh them..??
Ted
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opelitis1
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« Reply #23 on: November 09, 2010, 09:07:51 AM »

Here are the other (2) pics of the balancers..
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