Small Block & Big Block Chevy Specific Mouse & Rat Motor Discussion & Conversions

Flexplate for SBC

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Old Dec 23, 2008 | 01:55 PM
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Default Flexplate for SBC

Hi,
why are there two different sizes of flexplates for an sbc (153 and 168 tooth)?

I guess, to start an engine is easier with 168 tooth, is this correct?

If I have a 153 can I bulit in a 168?

James
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Old Dec 23, 2008 | 02:06 PM
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You can swap a 153 for a 168, but you need to change the starter too.
A starter for a 168 uses a diagonal bolt pattern. For the 153 the bolts are straight across.
All blocks have the diagonal bolt pattern, most have both, some don't have the straight across pattern.
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Old Dec 23, 2008 | 03:00 PM
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The larger plate is usually a truck flex plate, the smaller for cars. Camaros/firebirds and ect usually have the 153 and GMC/chevy trucks have 168.
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Old Dec 23, 2008 | 09:17 PM
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might as well go with sfi flexplate
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Old Dec 25, 2008 | 01:15 PM
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the reason is that there are two different starter drive sizes. the larger is for the 153 tooth and the smaller is for the 168 tooth. go to you local napa and they can get you part numbers on the drives and you can count the teeth.
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