72bluNblu said

It depends a lot on what transmission and what throwout bearing you use. You can buy them, RAM makes a bunch of different sizes that you can get through Summit. But I wouldn’t buy them until you measure. 72BBswinger used a 1/2” spacer with his Viper stuff, the T56 magnum and ‘vette TOB only needed a small shim.

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Riddler said

I also used a 1/2. I've tried a bunch of different ones when I was having issues but it turned out to be a bad clutch. I have a steel prototype one that I used brought to a waterjet and had them make me some.

Riddler

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