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Fastener sizes for TQ Converter and Flexplate

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Old Mar 3, 2004 | 07:59 PM
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Default Fastener sizes for TQ Converter and Flexplate

I am looking to buy ARP fasteners for my TCI converter and stock 98 flexplate. Anyone happen to know the sizes off hand?
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Old Mar 3, 2004 | 09:13 PM
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Unfortunately ARP flywheel bolts will not fit the stock flexplate. The ARP bolts have a non threaded shoulder on them that is longer then the thickness of the flexplate. You can see what I'm talking about in these pictures.





Unfortunately I'm not sure what size holes are in the TCI converter. Can someone else chime in with what you use?
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Old Mar 4, 2004 | 11:42 AM
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All of our new LS1 TCI converters have 7/16-20 threads.
Kevin
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Old Mar 4, 2004 | 12:36 PM
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Originally Posted by Kevin Winstead
All of our new LS1 TCI converters have 7/16-20 threads.
Kevin
Is this why you have to drill the flexplate when installing a TCI? Why not make them 10x1.5 like everyone else?
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Old Mar 4, 2004 | 05:27 PM
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Originally Posted by Kevin Winstead
All of our new LS1 TCI converters have 7/16-20 threads.
Kevin
Just to double check:They are 1.250 long?

Derty: The pictures help.The grip is obviously too long on those. Thank you.

Last edited by lerajie; Mar 4, 2004 at 05:39 PM.
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Old Mar 4, 2004 | 05:47 PM
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Kevin: I wouldn't mind paying an extra $8.00 ($7.88 through summit) for the converter if you included ARP fasteners with it. I won't use the ones TCI includes because I have no idea of their origin or make up. I can't see taking a chance with something like a fastener holding a heavy object that is spinning at outrageous RPM right by my feet.

Also, Do the ARP flexplate bolts fit your new Flexplates?
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