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Old 09-12-2008, 05:47 PM
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68 327 motor, harmonic balancer

What size and type of harmonic balancer does a 1968 327 motor out of a chevelle take. I know that they are a large journal motor, so I was told that they take a different harmonic balancer than small journal motors.
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Old 09-12-2008, 08:37 PM
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It depends, high performance? medium? low? I`m not sure of a difference in the small and large journal balancers. I do know that many of the small journal engines used a pressed fit and did not use a retainer bolt to keep the balancer in. If your 327 is a large journal block, you can use any neutral balance balancer except the 400 small blocks, and the later vortec balancer. You local parts store should carry the direct replacement balancer for your engine. If not, summit racing does.
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Old 09-12-2008, 08:50 PM
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The small journal 327 has a very small balancer.The large journal 327 needs a
large balancer, the 350 unit works well. The SFI summit brand is a quality
balancer for a good price.
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Old 09-12-2008, 11:08 PM
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should i use a 6.25 inch, a 6.75 inch, 8 inch, or some other size. Thanks
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Old 09-12-2008, 11:31 PM
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Here's what I use Summit SUM-B64262
Outside Diameter 6.625 in.
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Old 09-13-2008, 06:10 AM
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Not all small journal 327's used the small balancer. I know the 350HP 327 used the large balancer and had a crankshaft bolt in '66.
I think the high performance engines might have used the large balancer and maybe the milder versions used the small balancer.
JA
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Old 09-13-2008, 01:20 PM
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I'd go with an 8" and be done with it. You can use that on anything but a 400.
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Old 09-14-2008, 02:18 PM
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I have a 68, 327-350, with an 8" balancer.
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Old 09-14-2008, 04:38 PM
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Here are all the 327 offerings with part numbers from Damper Doctor.....

CHEVY 327 C.I. 8 68 68 Only; Timing mark in line with keyway CHE3273
CHEVY 327 C.I. 8 62-64 Round holes in hub; Step in back of the ring CHE4091
CHEVY 327 C.I. 8 62-68 6.25 inch Diameter; 1.2 inch Outer Ring Height CHE3271T
CHEVY 327 C.I. 8 64-66 Corvette; Nova; Finned Back CHE3272
CHEVY 327 C.I. 8 69-Up 2:00 Timing Tab Location; 6.125 Diameter CHE3071
CHEVY 327 C.I. 8 69-Up 6.25 inch Diameter CHE3271
CHEVY 327 C.I. 8 To-68 2:30 Timing Tab Location; 6.125 Diameter; Not Riveted CHE3072
CHEVY 327 C.I. 8 Up to 68 2:30 Timing Location CHE3502T
http://www.damperdoctor.com/Merchant...&Store_Code=DD
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