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Old 11-02-2020, 05:40 PM
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Default 1966 flexplate part number?

I've got a flexplate on the 66 OHC that I bought, but I think it might be a V8 flexplate.

I don't have a 1966 chassis parts book.

Anyone know the part number for the base 1966 OHC flexplate?

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Old 11-02-2020, 06:31 PM
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1966 Chassis Parts Book says group 0.666 1966 Tempest 6 with AutoTrans flywheel assembly is part # 9782927. It does not specify different part numbers for base or 4 barrel engine.

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Old 11-02-2020, 07:43 PM
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Default FWIW...

The Flywheels &/or Flexplates are the same for all 66-69 both 1BC & 4BC models.


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Old 11-02-2020, 08:01 PM
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Default Thanks!

Thanks for the quick responses, Bill & Jeff.
Of course, the flexplate on my engine is not correct. Glad I checked!
Joe

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1910 Buick Model 19 Touring
1923 Cadillac 5 passenger coupe
1933 Pontiac 4 door sedan project
1933 Sport Coupe project
1968 GTO, 428, THM400, 2.73 posi cruiser
1969 Chevrolet C10 Fleetside, 350, THM400
1958 Buick Caballero 4dr hdtp wagon
2018 Ram 1500 to tow stuff
2024 Buick Encore GX
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Old 11-05-2020, 02:17 PM
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Correct me if I'm wrong, but a V-8 flexplate won't bolt to the OHC engines... The bolt pattern is different if I'm not mistaken. That and the V-8's are externally balanced whereas the OHC's are internal.

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Old 11-05-2020, 05:28 PM
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Quote:
Originally Posted by 63 bomb View Post
Correct me if I'm wrong, but a V-8 flexplate won't bolt to the OHC engines... The bolt pattern is different if I'm not mistaken. That and the V-8's are externally balanced whereas the OHC's are internal.
That's what I thought, too.

The flexplate that came with this engine is GM #9779070.
That is appraently the correct flexplate for Pontiac 65-74 V8 with THM400 transmission, so I figured it must not be correct for my OHC application.

But I also found a reference that shows it is correct for the OHC with ST300 trans, which is the transmission that came with this engine.

I'm currently looking for a 9782927 flexplate that was mentioned in the earlier posts, but this 9779070 flexplate definitely fits on the crankshaft.

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"Keep your stick on the ice...and your head up."

1910 Buick Model 19 Touring
1923 Cadillac 5 passenger coupe
1933 Pontiac 4 door sedan project
1933 Sport Coupe project
1968 GTO, 428, THM400, 2.73 posi cruiser
1969 Chevrolet C10 Fleetside, 350, THM400
1958 Buick Caballero 4dr hdtp wagon
2018 Ram 1500 to tow stuff
2024 Buick Encore GX
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Old 11-06-2020, 07:21 AM
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I don't show that number listed in the parts book for Pontiac,
but did see a few old online posts listing it as Pontiac V8 and some stating late OHC 6??

It was also shown as a 14" 166teeth ring which is the same.
As far as I know, the bolt patterns are the same across the board.

Have you mocked it up with a stock starter to see if it would fit?

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When I die, I want to go peacefully like my grandfather did, in his sleep.
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Old 11-08-2020, 11:10 PM
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Sorry Jeff, I replied on 11/6, but my reply is MIA.

Yes, the starter interfaces with this flexplate.
I test-started the engine with this flexplate.
Joe

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"Keep your stick on the ice...and your head up."

1910 Buick Model 19 Touring
1923 Cadillac 5 passenger coupe
1933 Pontiac 4 door sedan project
1933 Sport Coupe project
1968 GTO, 428, THM400, 2.73 posi cruiser
1969 Chevrolet C10 Fleetside, 350, THM400
1958 Buick Caballero 4dr hdtp wagon
2018 Ram 1500 to tow stuff
2024 Buick Encore GX
  #9  
Old 07-02-2021, 08:33 PM
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I have found that the number I thought was the flexplate number (9779070) is actually the ring gear number.

I was able to find a correct flexplate.
Thanks all for responding.

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"Keep your stick on the ice...and your head up."

1910 Buick Model 19 Touring
1923 Cadillac 5 passenger coupe
1933 Pontiac 4 door sedan project
1933 Sport Coupe project
1968 GTO, 428, THM400, 2.73 posi cruiser
1969 Chevrolet C10 Fleetside, 350, THM400
1958 Buick Caballero 4dr hdtp wagon
2018 Ram 1500 to tow stuff
2024 Buick Encore GX
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