1966 mustang 289 flex plate????
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FalconEh
dr's wife racing
maverick
richter69
jason
9 posters
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1966 mustang 289 flex plate????
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?
jason- Posts : 220
Join date : 2009-08-14
Age : 52
Location : superior wi
Re: 1966 mustang 289 flex plate????
Should be a 157
richter69- Posts : 13649
Join date : 2008-12-02
Age : 53
Location : In the winners circle
Re: 1966 mustang 289 flex plate????
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?
maverick- BBF CONTRIBUTOR
- Posts : 3059
Join date : 2009-08-06
Age : 72
Re: 1966 mustang 289 flex plate????
Lots of little known details about '60's era small block balancing here: fordsmallblock.com/PDF/smallblockbalancing.pdf
maverick- BBF CONTRIBUTOR
- Posts : 3059
Join date : 2009-08-06
Age : 72
Re: 1966 mustang 289 flex plate????
I counted it twice, it's 160
jason- Posts : 220
Join date : 2009-08-14
Age : 52
Location : superior wi
Re: 1966 mustang 289 flex plate????
That might explain the chewed teeth.
maverick- BBF CONTRIBUTOR
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Join date : 2009-08-06
Age : 72
richter69- Posts : 13649
Join date : 2008-12-02
Age : 53
Location : In the winners circle
Re: 1966 mustang 289 flex plate????
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.
jason- Posts : 220
Join date : 2009-08-14
Age : 52
Location : superior wi
Re: 1966 mustang 289 flex plate????
Check your harmonic balancer
dr's wife racing- BBF CONTRIBUTOR
- Posts : 1655
Join date : 2009-08-20
Re: 1966 mustang 289 flex plate????
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
FalconEh- Posts : 1448
Join date : 2014-08-21
Location : on the blacktop or in the mountains ????
Re: 1966 mustang 289 flex plate????
http://www.fordmuscleforums.com/c4-transmissions/502485-1964-260-v8-flexplate-160-tooth.html Old 260 V8 maybe?
supervel45- Posts : 4498
Join date : 2013-09-04
Re: 1966 mustang 289 flex plate????
Forgot about the 63-64 260 (early) C40Z-B /C40E-B is it a 10 3/4 bolt circle. could be a punched 260
FalconEh- Posts : 1448
Join date : 2014-08-21
Location : on the blacktop or in the mountains ????
Re: 1966 mustang 289 flex plate????
I am thinking someone may have balanced it on a 289 because of the holes, but that is just a wild guess?
supervel45- Posts : 4498
Join date : 2013-09-04
Re: 1966 mustang 289 flex plate????
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?
gmsmkr- Posts : 1364
Join date : 2014-06-22
Location : alabama
Re: 1966 mustang 289 flex plate????
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.
supervel45- Posts : 4498
Join date : 2013-09-04
Re: 1966 mustang 289 flex plate????
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
Flywheel/flexplate counter-weight never changed on the OEM 289 engines
Re: 1966 mustang 289 flex plate????
Randy, what flex-plate was used on the Hi-Po engines?
crittersf1- Posts : 521
Join date : 2009-10-28
Re: 1966 mustang 289 flex plate????
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.
Re: 1966 mustang 289 flex plate????
Thanks Randy. Just tore one down that looks like it was assembled by a 2 year old.
crittersf1- Posts : 521
Join date : 2009-10-28
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