1966 mustang 289 flex plate????

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1966 mustang 289 flex plate????

Post  jason on July 7th 2014, 8:32 am

I'm working on this 66 mustang for a guy and the starter is bad, I also noticed the flex plate is chewed up. I pulled the trans. Last night. I counted 160 teeth on the flex plate. I know the 157 is compatible. My question is do I get a 0 balanced flex plate? I also noticed someone has drilled it opposite the counter weight. There's about (6) 1/4" holes not all the way through. My other question is does anyone make a 160 tooth ring that can be put on?
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Re: 1966 mustang 289 flex plate????

Post  richter69 on July 7th 2014, 9:05 am

Should be a 157
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Re: 1966 mustang 289 flex plate????

Post  maverick on July 7th 2014, 10:29 am

If the 289 has a stock rotating assembly, you'll need a weighted 157T flexplate. The drilling makes me think somebody has either rebalanced or TRIED to rebalance for some reason...maybe incorrect flexplate. Are you SURE about the 160T count?
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Re: 1966 mustang 289 flex plate????

Post  maverick on July 7th 2014, 11:07 am

Lots of little known details about '60's era small block balancing here: fordsmallblock.com/PDF/smallblockbalancing.pdf
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Re: 1966 mustang 289 flex plate????

Post  jason on July 7th 2014, 11:26 am

I counted it twice, it's 160
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Re: 1966 mustang 289 flex plate????

Post  maverick on July 7th 2014, 11:35 am

That might explain the chewed teeth.
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Re: 1966 mustang 289 flex plate????

Post  richter69 on July 7th 2014, 12:46 pm

Same
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Re: 1966 mustang 289 flex plate????

Post  jason on July 7th 2014, 1:23 pm

I think I'm getting closer. I can use the 157 tooth, and it looks like I have to use the 28.2 oz. flex plate. I just have to make sure it wasn't rebuilt and internally balanced.
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Re: 1966 mustang 289 flex plate????

Post  dr's wife racing on August 21st 2015, 10:28 pm

Check your harmonic balancer
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Re: 1966 mustang 289 flex plate????

Post  FalconEh on August 21st 2015, 10:40 pm

My understanding on SBF only 157 or 164 every flywheel or flexplate I have ever had has been either or, 164 starter on 157 FP/FW = eaten and vise versa. Where or on what did the 160 come from...unique, crossed over, not sure. All the old SB's were 28.xx or 50 balance (newer) or 0
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Re: 1966 mustang 289 flex plate????

Post  FalconEh on August 21st 2015, 11:11 pm

Forgot about the 63-64 260 (early) C40Z-B /C40E-B is it a 10 3/4 bolt circle. could be a punched 260
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Re: 1966 mustang 289 flex plate????

Post  supervel45 on August 21st 2015, 11:33 pm

I am thinking someone may have balanced it on a 289 because of the holes, but that is just a wild guess?

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Re: 1966 mustang 289 flex plate????

Post  gmsmkr on August 22nd 2015, 12:01 am

supervel45 wrote:I am thinking someone may have balanced it on a 289 because of the holes, but that is just a wild guess?

So the 260 wasn't 28oz balance?
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Re: 1966 mustang 289 flex plate????

Post  supervel45 on August 22nd 2015, 2:07 am

http://www.ebay.com/itm/1963-Ford-Car-Flywheel-Ring-Gear-F-M-2-289-CID-160-Teeth-Galaxie-500-Custom-/221788897856?hash=item33a3a60240 This guy is claiming they came on 1963 289 2speed Galaxie's. It's an oddball deal, for sure.

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Re: 1966 mustang 289 flex plate????

Post  rmcomprandy on August 22nd 2015, 12:01 pm

Almost ALL 289 engines which came in factory vehicles were OEM 28.2 in/oz externally balanced. The ONLY one different was the 289 Hi-Po which had a small hatchet weight behind the damper pinned to the timing gear on the crank.

Flywheel/flexplate counter-weight never changed on the OEM 289 engines

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Re: 1966 mustang 289 flex plate????

Post  crittersf1 on August 24th 2015, 11:58 am

Randy, what flex-plate was used on the Hi-Po engines?
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Re: 1966 mustang 289 flex plate????

Post  rmcomprandy on August 24th 2015, 8:50 pm

crittersf1 wrote:Randy, what flex-plate was used on the Hi-Po engines?

A 28.2 in/oz 160 tooth flywheel/flexplate is used with some 5 bolt bellhousing engines. A 6 bolt bellhousing uses 157 tooth or 164 tooth, 28.2 in/oz or 50 in/oz flywheel/flexplate. (Except the Mustang II which used a 144 tooth 28.2 in/oz  flywheel/flexplate).
I think all Hi-Po's were 6 bolt bellhousing blocks with a standard shift trans; 157 tooth, 28.2 in/oz flywheel.

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Re: 1966 mustang 289 flex plate????

Post  crittersf1 on August 27th 2015, 8:52 am

Thanks Randy. Just tore one down that looks like it was assembled by a 2 year old.
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