That's quite the balance depression from a drill on the outer ring somewhat out of the norm.
Used C5OE Harmonic Balancer
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- Official Post
Display MoreHere is an Ebay auction for a used C5OE Hipo harmonic balancer by Ebay member "mustangmasters428" with a starting bid of $595.00:
Here we have a 1965 66 or 67 hard to find factory original C5OE 289 High Performance Harmonic Balancer. The Ford engineers felt it necessary to add the extra balancing to their 271 horsepower 289 Hipo 4-barrel powerhouse. These hard charging motors received heavy duty rods and special crankshaft which demanded a thicker, heavy-duty balancer for this high revving motor. A signature item of all 289 HiPo's, Ford also carried this design into their 68 J code 302 4v's which were used in GT 350 Shelby's changing nothing but the part number and adding proper timing marks. This item is also correct for a 68 GT 350 Shelby and would make a good spare if not replacing your original unit.
This part is an original C5OZ not the later C8ZE-6316-A offered by Ford as a service replacement part after they depleted their stock of original C5OZ's. Coming to you in good used condition free of gouges or stripped threads and rubber in good shape, we feel this unit will make a great addition or replacement for your worn or tattered original and will bolt right on with no modifications and perform as originally designed. Whether as a spare, or as a replacement to get your car on the road, don't let this one get away as these are getting hard to find!
1965 66 C5OE Shelby 289 High Performance Balancer 289 HiPo Balancer | eBay
-Fred-
This used C5OE harmonic balancer received no bids by October 19, 2025 and therefore did NOT sell.
-Fred-
This used C5OE harmonic balancer is back on Ebay again with the same starting bid of $595.00:
1965 66 C5OE Shelby 289 High Performance Balancer 289 HiPo Balancer For motorASK | eBay
-Fred-
-
- Official Post
Display MoreDisplay MoreHere is an Ebay auction for a used C5OE Hipo harmonic balancer by Ebay member "mustangmasters428" with a starting bid of $595.00:
Here we have a 1965 66 or 67 hard to find factory original C5OE 289 High Performance Harmonic Balancer. The Ford engineers felt it necessary to add the extra balancing to their 271 horsepower 289 Hipo 4-barrel powerhouse. These hard charging motors received heavy duty rods and special crankshaft which demanded a thicker, heavy-duty balancer for this high revving motor. A signature item of all 289 HiPo's, Ford also carried this design into their 68 J code 302 4v's which were used in GT 350 Shelby's changing nothing but the part number and adding proper timing marks. This item is also correct for a 68 GT 350 Shelby and would make a good spare if not replacing your original unit.
This part is an original C5OZ not the later C8ZE-6316-A offered by Ford as a service replacement part after they depleted their stock of original C5OZ's. Coming to you in good used condition free of gouges or stripped threads and rubber in good shape, we feel this unit will make a great addition or replacement for your worn or tattered original and will bolt right on with no modifications and perform as originally designed. Whether as a spare, or as a replacement to get your car on the road, don't let this one get away as these are getting hard to find!
1965 66 C5OE Shelby 289 High Performance Balancer 289 HiPo Balancer | eBay
-Fred-
This used C5OE harmonic balancer received no bids by October 19, 2025 and therefore did NOT sell.
-Fred-
This used C5OE harmonic balancer is back on Ebay again with the same starting bid of $595.00:
1965 66 C5OE Shelby 289 High Performance Balancer 289 HiPo Balancer For motorASK | eBay
-Fred-
This used C5OE harmonic balancer received no bids by January 11, 2026 and therefore did NOT sell.
-Fred-
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- Official Post
Here is an Ebay auction for a used C5OE Hipo harmonic balancer by Ebay member "marjoebunney" with a starting bid of $325.00 and a Buy-It-Now of $325.00:
Ford 289 HiPo harmonic damper 65 66 67 ford 289 with K code engine option. No cracks in rubber. In dry storage in Las Vegas from the mid 80's. Buyer pays $27.00 shipping.
Ford 289 HiPo Harmonic Damper | eBay
-Fred-
This used C5OE Hipo harmonic balancer sold Marh 10, 2026 on Ebay for $325.00.
-Fred-
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- Official Post
Here is an Ebay auction for a used C5OE Hipo harmonic balancer by Ebay member "jollyroge" with a starting bid of $0.99:
Original Ford 289 Hi-Po harmonic balancer Shelby GT350 Cobra. Here IS an original 289 Hi-Po balancer that is in nice shape. This is the variation with the C5OE Ford part number. This was removed from an original 65 Shelby GT350 but would be correct for any 289 Hi-Po engine including Shelby Mustangs. It is in very nice shape with the seal surface showing hardly any wear . Nice clear timing marks and rubber that is not completely dried out . No extra holes drilled for strange balancing . The repro balancers are available but do not carry a Ford logo or part number on them
Here is your chance to get an original balancer that has not been all beaten up. This balancer would be correct for all 65-67 Shelby GT350’s and any other 289 Hi-Po powered vehicle including 289 Cobras. Another one this nice will not come along for some time if you need this for your K code car don’t pass it up! Winner pays actual UPS shipping charges. Good luck bidding !
Original C5OE Ford 289 Hi-Po K code balancer Shelby GT350 Mustang Cobra | eBay
-Fred-
This used C5OE Hipo harmonic balancer sold Marh 7, 2026 on Ebay for $810.00 with 19 bids from 14 bidders.
-Fred-
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- Official Post
Here is an Ebay auction for a used C5OE Hipo harmonic balancer by Ebay member "stedur5106" with a Buy-It-Now of $600.00:
289 Hipo Balancer E5. No bolts
-Fred-
This used C5OE harmonic balancer sold February 28, 2026 on Ebay for $475.00.
-Fred-
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