Gen 1 flywheel on LSx/LM7 - Anything wrong with this logic? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-25-2013, 12:16 AM
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Gen 1 flywheel on LSx/LM7 - Anything wrong with this logic?

Evening gang,

Can you put a Gen1 flywheel on a Gen3 engine? The answer is no. But can you if you really want to? :-)

Here is why I really want to. The gen3 flywheel is 14" diameter (168 tooth), the gen 1 is 12 3/4" (153 tooth) My bell housing wont fit the 14", and changing my bell housing is not an option (will explain further down).

Also, have read that the crank flange on LSx is 0.4" closer to the block than gen 1, that means that I've got to get my flywheel off the flange that amount to engage my input shaft correctly.

So here is my plan, please let me know if I'm missing something:

-LSx motor crank flange
-(3) of these shims (gets me 0.36" of the 0.4" I need)
Competition Engineering 4047 Competition Engineering Flexplate/Flywheel Shims
-My 153 tooth gen1 flywheel re-drilled for metric / LSx bolt pattern

Seems to easy. Am I missing something?

I'm building a mid engine corvair and am using a special bellhousing / adapter from from block (LM7 - actually LM4 /alloy) to corvair diff to saginaw in that order where the back seats were.

Here is where I got my input on the hurdles. Thanks!

Engine and Transmission Swap Gen III - Car Craft Magazine

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Old 01-25-2013, 07:38 AM
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Originally Posted by mikebuongiorno View Post
Evening gang,

Can you put a Gen1 flywheel on a Gen3 engine? The answer is no. But can you if you really want to? :-)

Here is why I really want to. The gen3 flywheel is 14" diameter (168 tooth), the gen 1 is 12 3/4" (153 tooth) My bell housing wont fit the 14", and changing my bell housing is not an option (will explain further down).

Also, have read that the crank flange on LSx is 0.4" closer to the block than gen 1, that means that I've got to get my flywheel off the flange that amount to engage my input shaft correctly.

So here is my plan, please let me know if I'm missing something:

-LSx motor crank flange
-(3) of these shims (gets me 0.36" of the 0.4" I need)
Competition Engineering 4047 Competition Engineering Flexplate/Flywheel Shims
-My 153 tooth gen1 flywheel re-drilled for metric / LSx bolt pattern

Seems to easy. Am I missing something?

I'm building a mid engine corvair and am using a special bellhousing / adapter from from block (LM7 - actually LM4 /alloy) to corvair diff to saginaw in that order where the back seats were.

Here is where I got my input on the hurdles. Thanks!

Engine and Transmission Swap Gen III - Car Craft Magazine
Ayuh,.... Chevy has pretty much Always offered a 153 tooth, 'n 168 tooth flywheel, 'n I believe, still does...

It's much easier to find the Right flywheel, as the balance will be Very different doin' it yer way....
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Old 01-25-2013, 10:01 AM
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Thanks for the reply. I believe gen3 is internally balanced and I haven't been able to find a 153 tooth anywhere online drilled for the metric gen 3 flange/bolt pattern.
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Old 01-25-2013, 10:35 AM
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The flywheel will be less of an issue than a starter motor that fits. Good luck finding that!

Russ
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Old 01-26-2013, 03:26 PM
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Tilton makes a flywheel,51-4473, and starter,54-10012, for the 153 tooth LSX, but is for use with a 5.5" clutch. They can probably provide you with a modified part for your app.
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