327 harmonic balancer - Team Camaro Tech
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post #1 of 16 (permalink) Old Dec 26th, 16, 05:55 PM Thread Starter
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327 harmonic balancer

Hey guys, searched a lot of threads but couldn't find the answer so here goes.
When I had my motor rebuilt 3 years ago I had problems getting it timed. Took it to a race guy and he figured it out. Turns out the harmonic balancer that is on there is from a 350 so the timing marks are off by 25 degrees or so.
I searched around and found what looks like the right one and had it shipped out here from summit. Opened the box and it's EXACTLY like the one I removed with the same timing marks.
Anyone got advice?


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post #2 of 16 (permalink) Old Dec 26th, 16, 06:09 PM
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Re: 327 harmonic balancer

A 327 should have the timing mark directly in line with the keyway groove. You can make a corrected timing mark on the damper using a three cornered file or a hack saw. Just don't get too carried away and go real deep when you make the new mark. You may want to paint a white line on the new mark so you are sure which line is which.
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post #3 of 16 (permalink) Old Dec 26th, 16, 06:10 PM
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The new HB may be for a 'long water pump' belt drive, 69 and later, where the scale was at 12:00 vice 2:00
Remove all plugs, wrap HB with masking tape, put a Tape flag at a distance of approximately 1/8 inch from fly head on a screwdriver shaft, bolt on a degree wheel, bring Cyl 1 to estimate TDC, and turn crank until screwdriver tape touches head.
Note degree mark.
Reverse direction and repeat degree marking on other side of TDC.
Divide marked distance by two, pencil mark TDC mark aligns with scale 0 dogs.
Now HB should be 'zero'd' with scale and Cyl 1 at TDC, or very close to it.
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post #4 of 16 (permalink) Old Dec 26th, 16, 07:50 PM
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Re: 327 harmonic balancer

Here is the harmonic balancer that you should have purchased from Summit Racing. https://www.summitracing.com/parts/p...t/model/camaro
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post #5 of 16 (permalink) Old Dec 26th, 16, 07:55 PM
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Re: 327 harmonic balancer

I agree with Jon that the mark should be inline with the keyway. I just went through this myself and had to look at pictures closely to make sure I got the right one for a 327. You don't show where the mark is on your balancers but you should verify tdc as Everett suggests no matter what before you try to time it.

1967 RS 327/275hp
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post #6 of 16 (permalink) Old Dec 26th, 16, 08:15 PM
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Re: 327 harmonic balancer

The one you need should be marked two degrees before the keyway. The 69 - up version is 10 deg before the keyway. There is also a motor home, van and other application damper that has the marks retarded from the keyway and you look down behind the water pump to set timing.
If it's the 10 deg marking, just change the timing tab to the 69 up style, or re-mark your damper.
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post #7 of 16 (permalink) Old Dec 27th, 16, 08:12 AM
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Re: 327 harmonic balancer

If you are going to go through the effort to mark it up, makes marks every 90 degrees also. Very helpful for valve adjustment. You can do all 8 cyl in two revolutions.

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327 L30, K-K, Deluxe int, tach & gauges, 12 bolt posi, 4 speed.

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post #8 of 16 (permalink) Old Dec 27th, 16, 07:20 PM Thread Starter
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Re: 327 harmonic balancer

Couldn't get it timed but the damn marks look to be correct. Wth.



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post #9 of 16 (permalink) Old Dec 27th, 16, 07:21 PM Thread Starter
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Re: 327 harmonic balancer




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1967 RS Convert. numbers matching 327/275 with 4 speed hurst on top of a saginaw, 12 bolt 355 rear end, console w/gauges & deluxe int., ORIGINAL PLUM!
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post #10 of 16 (permalink) Old Dec 27th, 16, 07:48 PM
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Re: 327 harmonic balancer

Let's see a picture of the timing cover and the timing mark on your engine. Is it the timing tab welded on or a bolt on affair? It could possibly be mismatched to your damper.

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post #11 of 16 (permalink) Old Dec 28th, 16, 09:14 AM Thread Starter
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Re: 327 harmonic balancer

Quote:
Originally Posted by dyno jonn View Post
Let's see a picture of the timing cover and the timing mark on your engine. Is it the timing tab welded on or a bolt on affair? It could possibly be mismatched to your damper.


It's welded to the timing cover. I can take a pic when I get home tonight.


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post #12 of 16 (permalink) Old Dec 29th, 16, 06:03 AM Thread Starter
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Re: 327 harmonic balancer

Quote:
Originally Posted by imbucky View Post
It's welded to the timing cover. I can take a pic when I get home tonight.


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Here's the timing cover.





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post #13 of 16 (permalink) Old Dec 29th, 16, 07:08 AM
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Re: 327 harmonic balancer

That's the correct timing tab which looks to be original and you have the right balancers so your timing issues are the result of a different problem. You haven't said what the issues were. Just that you couldn't get it timed right. Verify that TDC of the number one cylinder aligns your marks and go from there. You said you had it rebuilt. Why didn't your rebuilder check the timing?

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post #14 of 16 (permalink) Old Jan 1st, 17, 11:47 PM
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Re: 327 harmonic balancer

Don't forget to disconnect the vacuum advance hose when setting timing.

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post #15 of 16 (permalink) Old Jan 2nd, 17, 09:14 AM
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Re: 327 harmonic balancer

The timing chain being one tooth off can require excessive timing advance to make an engine run also. Not sayin that's what is happening, but.....

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