Re: 1966 Flexplate
[Re: 426lloyd]
#3051517
06/18/22 02:54 PM
06/18/22 02:54 PM
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Posts: 25,786 Rio Linda, CA
John_Kunkel
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Difference in the crank flange register is the inside diameter, outside is the same I think. An early 904 converter hub is 1.550", later is 1.810" same as the 727.
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Re: 1966 Flexplate
[Re: 426lloyd]
#3051586
06/18/22 08:30 PM
06/18/22 08:30 PM
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Sniper
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Ok I have the correct converter for the small 273 registry , so I guess I need a small registry flexplate also to fit the 273 crankshaft , correct , does anyone have the correct hole size for the flexplate . What part of the outside register is the same and that the flexplate registers on that outside diameter do you not understand? You can reuse your existing flexplate.
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Re: 1966 Flexplate
[Re: 426lloyd]
#3051593
06/18/22 09:20 PM
06/18/22 09:20 PM
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Posts: 20,177 Park Forest, IL
slantzilla
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On the Slants the OD of the registers were different too. I always figured the small blocks were the same?
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Re: 1966 Flexplate
[Re: 426lloyd]
#3051602
06/18/22 10:09 PM
06/18/22 10:09 PM
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Posts: 15,355 Omaha Ne
TJP
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Let's try this , I have a1966 273 engine with a 904 transmission . The crankshaft has the small registry hole for the converter. I have the correct converter and need a flex plate . My question is will a 1968 and up flexplate work or is the the registry hole in the flexplate a different size for the 1966 . I believe what Sniper was trying to get across is the Flexplate "registers /centers) on the crankshaft "LIP" OD that raises anbe the flange and only needs to match the converter 4 hole pattern size wise. And the converter Hub should match the crankshaft ID
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Re: 1966 Flexplate
[Re: 426lloyd]
#3051747
06/19/22 03:11 PM
06/19/22 03:11 PM
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Joined: Jan 2003
Posts: 25,786 Rio Linda, CA
John_Kunkel
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FWIW, the 273/904 flexplate part number for '66 is 2204403 (same for the /6), for '68-later it's 2400885.
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Re: 1966 Flexplate
[Re: 426lloyd]
#3051773
06/19/22 05:08 PM
06/19/22 05:08 PM
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Posts: 25,786 Rio Linda, CA
John_Kunkel
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Measure the OD of the register.
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Re: 1966 Flexplate
[Re: poorboy]
#3052958
06/24/22 12:16 PM
06/24/22 12:16 PM
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Posts: 3,075 Michigan
A727Tflite
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Sorry, late to the game. I thought the change in the register diameter was done in 64/65. 66 should have been the later version.
For what its worth, as long as the flex plate fits over the crank flange, the larger diameter register flexplate still works on the small register flange. The 6 bolts will hold it fine. At least it did on the one I beat the crap out of for nearly 60,000 miles. Geeez, I wonder why engineering spent all that time and money developing the fit and function of the flex plate pilot hole to crank flange radial and lateral runout spec.?
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Re: 1966 Flexplate
[Re: poorboy]
#3052962
06/24/22 12:28 PM
06/24/22 12:28 PM
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Posts: 18,416 UPPER MICHIGAN, MARQUETTE COUN...
NITROUSN
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Sorry, late to the game. I thought the change in the register diameter was done in 64/65. 66 should have been the later version.
For what its worth, as long as the flex plate fits over the crank flange, the larger diameter register flexplate still works on the small register flange. The 6 bolts will hold it fine. At least it did on the one I beat the crap out of for nearly 60,000 miles. Better buy lottery tickets.
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